Re: 243AIor 257AI
I have built two 257RAI and two 243W rifles for myself.
I shot 4 mule deer with a 257 in 2012.
The 115 gr Nosler ballistic tip 257 bullet at 3050 fps muzzle [49 gr H4350 =~ 56kpsi] zero'd at 200 yards, scope 1.5" above bore:
At 500 yards this will have a 7 moa elevation correction, 3.6 moa windage correction for 10 mph cross wind, 2087 fps =1112 foot pounds
While I only shot the deer out to 400 yards last year, the cartridge has plenty of power at 500.