Out to 300. Not beyond unless a follow up. At 300 yards the Barnes TTSX in .243 is advertised to have velocity of 2486 FTPS, and energy of 1098 FT-LB from an 80 grn. bullet. I called and asked a Barnes representative and he said that the bullet needs 1500 FTPS to expand.What ranges do you think you'll get a shot at an antelope? Under 100 yards or over 300?
From What I read, thin skinned animals like the antelope need a minimum of 800 FT-lb of energy for appropriate killing power (which this exceeds); and the velocity at that range exceeds what is advertised as necessary by the bullet manufacturer for proper expansion, so I was thinking I'd be good.