At work I use a $ 25,000 Silicon Graphics workstation to perform hydrocode calculations of terminal performance for military applications. Even with this computing power runs require several days to complete in many cases. And they are not nearly as complex as the problem of a hunting bullet striking a game animal! The complexities of that problem are truly daunting. Bullets are manufactured from multiple materials and have variable material properties from tip to base.
But the real problem is the target itself. Even if I am successful in making a simplified version of the analytical solutions to penetration and cavity formation by a projectile which will run on a PC, it will never tell you if the game drops in its tracks or runs for 200 yds. That determination is beyond knowing because it depends upon the animal. Identical wounds by identical weapons will create different responses in different animals.
Now the good news is that I think I will eventually be able to provide a tool which will describe the dimensions of the hole (hopefully even through major bones). In general though, any hole 1/2 inch in diameter through the thorax will kill, so this information is not terribly valuable. Again, a bigger hole will increase the probability that an animal will fall quickly, but it guarantees nothing. I've seen deer with their heart blown entirely away run over 100 yds. On the other hand, who really cares if it falls instantly or in 10 seconds?
I pride myself with the fact that every deer I have killed (with a rifle, as opposed to a shotgun) dropped instantly. But my success as a hunter would not be diminished if they ran 50 or 100 yds. Even a poorly performing bullet when placed properly will kill with dispatch. I think part of the current interest stems from the fact that American shooters always want "bigger and faster" regardless of whether they need it or can handle it. Few shooters are decent marksmen and they think that the problem is a lack of "stopping power".[/b]
Originally posted by Spitzer@Mar 20 2003, 08:10 PM
That's funny, I've dropped many deer "in it's tracks" with my .338WM. I guess I must have been seeing things.![]()
BY: BOB JOURDAN
When we arrived on the scene the hunters were diligently heaving on a rope leading out into a pond to a very dead five point bull elk. Somehow that elk had managed to splash out into the middle of the pond to cash in his chips. We stopped long enough to visit from the truck window with one of the hunters and to see the successful retrieval of the big bull…and to observe his much shot-up condition. The hunter commented on just how much lead a big bull can absorb, and that had they not been using .300 Winchester Magnums and .338s, the bull might have escaped. It took six or eight hits to end him, but in his last moments of flight he had blindly charged off into the pond. Of those hits, the hunter assured us that at least four or five were right through the heart-lung area…even though we could plainly see bloody wounds in the hip, flank, side, one leg and perhaps one in the chest. With that, we moved on our way.
In our many years of hunting in the mountains we've always enjoyed visiting the hunter camps, especially when game was hanging from the meat poles. The excited stories told by the various hunters were interesting, running all the way from how they made the kill at ridiculously long range to knocking the buck down at less than 25 yards. And most of them were always happy to bring out their favorite firearms to show off. They, too, ran the gamut from beautiful custom instruments that would be much more at home under glass and lights, to plain-Jane lever actions that were modern back at the end of the nineteenth century. Calibers ranged across the spectrum from six millimeter, as small as little wildcats based on something like the .222 Magnum, up to stovepipe calibers of .444 Marlin, .45-70, .375 H&H Magnum, and more often the .300 Winchester Magnum and .338 Winchester Magnum mentioned above. The game hanging from the racks showed everything from clean kills to those that were shot all over and looked like hamburger. We found that invariably the clean kills were made with relatively small calibers and the hamburger kills came from belted magnums and stovepipe bores. It was rather obvious that shooters ranged from good to bad, but it always seemed there was a definite correlation between bad shooters and big cartridges. This did not necessarily mean that those who used medium to small cartridges were always good shots, but it sure did show that correlation, too. And our friends back at the water pond were more evidence of the big cartridge, bad shooter scenario.
We knew, even back a half-century ago, that recoil bothered our shooting but we really did not want anyone to know. We tried to keep our targets showing groups of less than two inches, and any that were larger we simply blamed on the wind or the cartridges or the firearms, or even the good old military excuse of 'calling' our bad shots. Trouble with this system was that all too often the 'called' bad shot landed right in the middle of the group! But with time we also began noticing that we shot better with milder cartridges. Many writers of those long ago days tried to tell us that smaller cartridges were simply inherently accurate, whatever that means. They hardly ever admitted to the milder recoil being partly to blame for the better accuracy. The first big game rifle I personally came up with was a .270 Winchester, by default. I had wanted a .257 Roberts as recommended by my knowledgeable dad, but when talking with the druggist who ordered it he thought something bigger would be a better choice in the event that we could not get the .257. Thus, the .270 arrived with a note stating that if we did not want it, simply return it. Being a young fellow back then, a new rifle in hand was worth much more than one in the future. I kept the Remington Model 760 pump in .270 caliber.
The move from a rimfire .22 directly to the .270 was abrupt and interesting. From that very first shot with the poorly stocked and rather hard kicking .270, I picked up quite a healthy flinch. During those first few years there were times when there would be a misfire and I would nearly jump off the bench. The flinch was severe. But since that was my only rifle, I did the best I could with it. By the time the new left-hand Savage bolt action rifles came out in .243 Winchester caliber, I knew I should have one to test what all big-time writers had been saying, that recoil of the .243 was insignificant. The day that new Savage arrived I headed straight to the range with a fresh box of Savage factory ammunition…and found that all writers must be misinformed. That little rifle did produce recoil, although it was considerably less than that of my .270. The well developed flinch did not go away, even though shooting became a bit more enjoyable.
Since I had both the great .270 as well as the mild .243, I alternated their use on deer for the next few years. And that is when we started discovering that bullet placement was somewhat better with the milder cartridge and deer hit with it gave up the ghost just as quickly, if not quicker, than when hit by the great .270. But we still noted that a deer hit in the leg, flank, paunch, etc., was hard to kill with either cartridge and required additional shots. Conversely, deer hit correctly with either cartridge were equally easy to bring down.
As the years passed, I became more interested in pure accuracy and entered the benchrest game where the ultimate goal is to place five consecutive shots into one hole no larger than one bullet diameter. The shooting technique for this blew me away. Even though I thought I could shoot reasonably well, and better than most of my hunting friends, I could not keep five shots anywhere near one hole even with a fine benchrest rifle. My learning to really shoot had just begun. It was here that I learned what the least bit of rifle movement before the bullet left the muzzle would do on the target. With these more or less exotic benchrest rifles and their temperamental firing systems, at least from the beginner's standpoint, there were misfires. And again the well learned flinch really showed up. With these heavy bench guns and their small 6mm PPC or BR cartridges the recoil was very mild and of almost no damaging consequence. Before long I found that flinching could be completely eliminated, and from that point on I knew my big game shooting would improve as I finally knew the details and saw the consequences of flinching.
My visits to the local shooting range soon verified, again, that hunters shooting the larger calibers shot the worst. And on a few occasions hunters would let me load their rifles and hand them back for the next shot. Sometimes I would hand back an empty rifle. At the fall of the firing pin the hunter would nearly jump off the bench. The embarrassment was severe…some never allowed me to load for them again. But during this time I was rather pleased with my own rifle shooting improvement and when a misfire would occur the crosshair commonly would not move. I knew my learning curve was near complete, my flinching was somewhat understood and under control, and my placement in benchrest competition was moving up.
This education, plus some common aging, was changing my ideas about big game shooting. No longer did I jump a buck out of the rocks and start blazing away as in the past. I became a much more careful sight holder and trigger controller. And I even discovered that I was finding more bucks still bedded instead of off and running. Without my famous past flinching, I could now make killing shots on standing game at very long ranges as compared to those commonly missed in years gone by. By becoming much more aware of the effects of recoil, I started using different calibers that were milder, especially those like the .250 Savage, .250 Ackley Improved, 6.5x55 Swedish, etc. And they were wonderful killers in the game field…without brutal recoil. I soon sold all my big belted bombers, giving up things like the 7mm Remington Magnum, .264 Winchester Magnum, .300 Weatherby Magnum, along with my last .30-06, the caliber that seemed to be the dividing line for recoil tolerance.
Recoil becomes a factor in shooting due to the sheer energy, in foot-pounds, of the sudden kick, plus the psychological effects of muzzle blast. When shooting two rifles of the same weight and using the same cartridge but different barrel lengths, it is common for shooters to think the one with the shorter barrel kicks harder. Actually the short barrel simply increases the muzzle blast. There have been a number of examples of this when a factory model with a very short barrel does not sell well, and yet another with a longer barrel and the same weight sells very well. The difference is the perceived blast and not necessarily the sheer recoil. Another factor in recoil is the fit of the stock. If the stock has too much drop at the comb and heel, the rifle will recoil back as well as up and smack the shooter across the jaw, leaving him with a toothache or black eye the following day. A straighter stock with very little drop will send the recoil straight back, and if the stock comb is slightly lower than the heel, the shooter's face will be saved. This greatly reduces perceived recoil, even though the recoil energy is the same. When we add heavy calibers to shorter barrels and poorly designed stocks, it is very easy to develop a severe flinch. And we should add that the flinch occurs so quickly that the shooter will deny flinching, every time. It is only when he has a misfire at the bench that he visibly jumps when the firing pin falls. Sometimes this brings him around to admitting to a flinch…. But the story that I love best is from the hunter-shooter that has just demonstrated his wild flinch at the shooting bench, but says he never flinches when shooting at game in the field!
Recoil Chart 1: Mild Recoil Cartridges In 8-Pound Rifles
1. .223 Rem., 55 gr., 3240 fps, 26 grs. powder 3.6 ft/lbs
2. .22-250 Rem., 55 gr., 3680 fps, 38 grs. powder 5.8 ft/lbs
3. .25-35 Win., 117 gr., 2230 fps, 28 grs. powder 6.1 ft/lbs
4. .250 Sav., 100 gr., 2820 fps, 36 grs. powder 8.1 ft/lbs
5. .257 Roberts, 120 gr., 2650 fps, 36 grs. powder 9.4 ft/lbs
6. .243 Win., 100 gr., 2960 fps, 45 grs. powder 10.2 ft/lbs
7. .30-30, 150 gr., 2390 fps, 35 grs. powder 10.8 ft/lbs
8. .30-30, 150 gr., 2390 fps, 35 grs. powder 14.4 ft/lbs 6# rifle
9. 6.5x55 Swedish, 140 gr., 2550 fps, 42 grs. powder 12.2 ft/lbs
10. .257 Robt. Lt. Mag., 120 gr., 2940 fps, 45 grs. powder 12.6 ft/lbs
11. .260 Rem., 120 gr., 2890 fps, 46 grs. powder 12.6 ft/lbs
It is often stated that a certain caliber has negligible recoil. This may be a subjective statement from one who is numb and immune to certain punishment. Most shooters who have made a serious study of shooting seem to agree that damaging recoil always starts showing on average shooters long before reaching recoil levels of the .30-06. The .30-06 seems to be considered the breaking point in recoil tolerance simply because so many fellows were militarily trained with that caliber in the past. The difference now is that they are no longer shooting a 10-pound, gas operated rifle where the recoil is reduced by perhaps 25%. In the sporting world that .30-06 is often a bolt action that weighs a couple of pounds less. The recoil then becomes formidable and must be reckoned with
When we go back in history we find much praise was constantly being poured on such cartridges as the .25-35, .30-30, .250 Savage, .257 Roberts, .256 Newton, 7x57 Mauser, .35 Remington and a few others being used in the big game hunting fields. The .300 Savage was considered a rather heavy hitter, and most country folks simply shuddered when the .30-06 or .270 was mentioned. They all thoroughly understood the correlation between accuracy and recoil, and simply did not have time to waste trying to learn to handle heavy recoil when there was no need to do so. They understood that the most important thing in taking down a big buck or bull was to place the bullet properly. And they knew that if they had to worry about being whacked in the jaw by recoil they could not concentrate very well on placing their shot properly. These were experienced shooters who shot big game for meat on the table. They shot varmints to protect their livelihood. They did not read the latest shooting journals or hang out in the local sporting goods shop, and were very hard to change in their ideas of cartridges for use on game. When the mad magnum craze started after World War II, these fellows stayed in the background and continued taking game with their easy handling rifles and cartridges. Today they are a vanishing breed, and many of their fine cartridges are being relegated to obsolescence, or very near so.
Today's shooters and hunters need to look back, take a lesson from the past, leave the larger, harder to manage cartridges to others, to experimenters and developers who have to try big boomers, and to the very few who may tolerate being beat on by heavy recoil. To become an effective shooter one has to avoid flinching, and that is best done by using milder cartridges. Recoil tolerance does end at some point for every shooter, and the majority seem to find that level somewhere less than about 15 foot-pounds (ft/lbs), and are in trouble for sure when they reach 20 ft/lbs. Examples include those mentioned above when used in eight pound rifles starting with perhaps the minimum deer cartridge, the .25-35 Winchester with only 6.1 ft/lbs of recoil, the .250 Savage with about 8.1 ft/lbs and on to the .300 Savage with about 13.9 ft/lbs. The modern 7mm-08 Remington produces 14.8 ft/lbs compared to the famous 7mm old-timer, the 7x57 Mauser, with 13.7 ft/lbs, close to the newer .260 Remington at 13.9. The .260 is a 6.5mm and often compared with the fine 6.5x55 Swedish with 12.2 ft/lbs of recoil. When rifle weight is lowered to that of the Winchester M94, the .30-30 delivers about 14.4 ft/lbs of recoil, and many shooters will tell you about being kicked rather badly by that good old .30-30. When the .30-30 is loaded in an eight-pound rifle, the recoil drops to only 10.8 ft/lbs. One of today's darlings, the .243 Winchester, shows about 10.2 ft/lbs of recoil, somewhat more than that found in the .257 Roberts at only 9.4 ft/lbs.
Recoil Chart 2: Tolerable Recoil Cartridges In 8-Pound Rifles
1. .25-06 Rem., 100 gr., 3230 fps, 55 grs. powder 13.4 ft/lbs
2. 7mmx57 Mauser, 140 gr., 2660 fps, 46 grs. powder 13.7 ft/lbs
3. .260 Rem., 140 gr., 2750 fps, 44 grs. powder 13.9 ft/lbs
4. .300 Sav., 150 gr., 2630 fps, 42 grs. powder 13.9 ft/lbs
5. 7mm-08 Rem., 140 gr., 2860 fps, 45 grs. powder 14.8 ft/lbs
6. .308 Win., 150 gr., 2820 fps, 46 grs. powder 16.2 ft/lbs
7. .270 Win., 130 gr., 3060 fps, 58 grs. powder 17.8 ft/lbs
8. .30-06, 150 gr., 2910 fps, 55 grs. powder 19.1 ft/lbs
9. .270 WSM, 130 gr., 3300 fps, 66 grs. powder 21.6 ft/lbs
10. 7mm Rem. Mag., 150 gr., 3110 fps, 65 grs. powder 23.6 ft/lbs
11. 7mm RSAUM, 150 gr., 3075 fps, 59 grs. powder 23.6 ft/lbs
The running gun-battle between believers in the .30-06 and those of the .270 generally find that there is a slight accuracy difference in favor of the .270. One reason is that factory barrels are cut to the same exterior contour and the one with the smaller bore will of course have thicker sidewalls making it stiffer and therefore more accurate. But the other reason is the 7% lighter recoil of the .270. This is noticeable by every shooter and often leads to better gun handling and better accuracy. Both calibers offer more recoil than average shooters can readily handle, with the .270 producing 17.8 ft/lbs and the .30-06 about 19.1 ft/lbs. Both calibers can be handled by a number of shooters, provided they practice a great deal and stay very conscious of flinching. When they can sit calmly and steadily through a misfire on the bench, they will know they are handling the calibers satisfactorily. But once a flinch is developed, it is difficult to get rid of. The quickest cure recommended by many is to drop back to a very light caliber, even the .22 rimfire, and start over. Have your shooting partner do the loading and hand the rifle back to you, leaving it empty once in a while. If you snap the occasional empty chamber without moving, you are on your way to a cure.
We often read about the effects of recoil, but usually do not have access to recoil charts. It seems that recoil can be calculated in several ways, but all give the same relationship from one cartridge to another. The variance among different methods is not more than about 10%. Therefore, the difference you might find between the charts shown and charts you might calculate are the result of the methods used. The charts used in this article are based on eight pound rifles and are divided into three groups. The first shows a number of mild cartridges with recoil less than 13 ft/lbs. The second chart moves on from 13 ft/lbs to cover cartridges with less than 25 ft/lbs. These are cartridges that surely divide shooters, some handling them okay, while most shooters will flinch to some degree. The last chart shows cartridges with 25 ft/lbs recoil to something you might not want to know about. Very few shooters can use these cartridges and maintain good accuracy. In the heaviest recoiling group, several different rifle weights are used to show the effects of adding gun weight to reduce that brutal recoil. Where do you think you might fit in?
Recoil Chart 3: Heavy Recoil Cartridges In 8-Pound Rifles
1. .300 RSAUM, 150 gr., 3220 fps, 65 grs. powder 24.6 ft/lbs
2. .300 WSM, 150 gr., 3275 fps, 66 grs. powder 25.4 ft/lbs
3. .300 Win. Mag., 150 gr., 3290 fps, 75 grs. powder 28.4 ft/lbs
4. .375 H&H, 270 gr., 2670 fps, 77 grs. powder 46.4 ft/lbs
5. .458 Win-Mag., 450 gr., 2150 fps, 73 grs. powder 68.0 ft/lbs
6. .416 Rem-Mag., 400 gr., 2400 fps, 85 grs. powder 73.2 ft/lbs
7. .378 Wby-Mag., 300 gr., 2950 fps, 114 grs. powder 80.0 ft/lbs
8. .460 Wby-Mag., 500 gr., 2530 fps, 116 grs. powder 129.8 ft/lbs, 8# rifle
9. .460 Wby-Mag., (same as above) 86.5 ft/lbs, 12# rifle
10. .50 BMG, 750 gr., 2800 fps, 233 grs. powder 404.4 ft/lbs, 8# rifle
11. .50 BMG, (same as above) 202.2 ft/lbs, 16# rifle
12. .50 BMG, (same as above) 101.1 ft/lbs, 32# rifle
Since the end of World War II we have seen the pendulum swing from the proliferation of mild, rather easily handled cartridges to ever increasingly powerful belted magnums and on to the new non-belted magnums of equal or more power. But accuracy records still fall to tamer, smaller rounds. Even in long range target shooting, such as the 1000 yard matches, smaller cartridges are slowly taking over with the belted magnums giving way to such relatively mild cartridges as the 6.5x06 Ackley Improved, 6.5x284, 6.5x55 Swedish, .260 Remington and even the standard .243 Winchester, just to name a few. All of these cartridges develop less than 20 ft/lbs of recoil. And these shooters often comment about being better able to hold without flinching. They know the milder recoil has led to better groups on target.
The next time you are cruising around checking hunter camps and meat poles, take a look at the game hanging. If the game has been taken cleanly with one shot, placed properly, you can bet it was taken with some rifle with recoil not exceeding that of the .30-06. On the other hand, if the game is shot-up, hit all over, you will find in most cases the shooters were using the big, bad, belted boomers with plenty of recoil.
Keep shooting…but drop back to those cartridges you can shoot without flinching. Your targets will appreciate it.
Bob Jourdan
PS & TAR Staff[/b]