ok, ran the numbers I already knew, if said 1080 yrd muley buck was shot with a 115gr at 3150 fps mv, even at sea level it would still have about 1650 fps at impact, ooh and that s.d. though, .278, little needle will have no problem with deer size game penetration at minimum impact velocity
a .243 set up modern for this sort of work using 105's and up...1100 yrd deer are not an issue for the 'cartridge' itself, it's all up to the shooter, here I am defending the .243 on a .243 thread
while also pointing out other choices the op may consider, as he may not be interested in building a .243 that can shoot 115's and all that goes with it...would it fit in a standard magazine even?
you can take a standard cartridge case and make it do a lot more than the original spec if you take things far enough from the gun itself, to reloading etc.
factory to factory though...there are some good choices to also consider when looking at a .243
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