Thanks, guys, it was a great hunt.
PF21,
Have had great luck with 338FED. My son (age 13) has a Kimber 84Montana in 338FED and I have the DPMS. Both have done good service. My son has taken animals up to eland and crocodile (in Africa) as well as assorted plains game. In North America, he's used it on black bear (obviously), whitetails, mule deer, pronghorn, and aoudad (and pigs). His rifle is much more accurate than mine (or, maybe, the shooter is more accurate?) and he has taken game out to 535 yds (aoudad) with it.
We tend to use lead-free ammo (200g Trophy Copper Federal) although the deer and sheep were taken using 180g Accubond. I've read on some blogs about cycling issues with AR's in 338FED but I haven't had any using 200g Trophy Copper, 200g Trophy Bonded Tip, 180g Accubond, 185g TSX Federal Factory ammo or with 200g Federal Fusion ammo. For my son's rifle, we made some 210g TTSX handloads -- nice (on the eland, kudu, oryx, etc) but too long for the DPMS.
I think the 338FED is one of the best all-around cartridges out there right now. My son has been shooting it since he was 10 (about 75 lbs) and my daughter (age 15) has used his rifle in Africa and in the Midwest on whitetails. Neither had trouble with recoil.
For the AR platform, I like the 338FED for anything in North America, except the bigger bears (although, having said that, a 7'7" black bear is almost as big as an interior grizzly so, maybe I'm unduly cautious). I would not hesitate to use it on bison or moose.
Anyway, hope that answers your question.
Best,
BR (Y85)