I've shot antelope with a 300WM once, felt a little "overgunned", but did make a good first round hit at 347 long steps. The 280 AI/150NBT was good, as was the 6mm/284 and 6.5/284 I used. When I finally get my Mod 70 7x57, we will see how it shoots, but I'm back to as lwt rifle out in those prairie winds. My .243 is Sporter weight and my 300WM/Mesa is heavy enough, but I'm back to the "overgunned" thing.
For the occasional antelope, long range coyotes, maybe Texas Exotics; What is the flattest/wind defying round among the 300WM/130 TTSX, 7mm RM/120TTSX, 264WM/130, 6.5 PRC, 257wby/115NBT, 25-06/115NBT, 240wby/95NBT?
Sporter weight or heavier?
From the sounds of it, your 243 should work well enough if it is twisted right. Are you able to shoot heavies? However, if you think 347 yards is a long shot, your 243 with cheap 100gr BTSP's or 95gr ballistic tips will work just fine..
