Yes
I’ve shot 123 Hornady amax over XBR 8208 in my 20” ar style Grendel with fantastic accuracy. I haven’t killed an antelope with it, but shot many with a 260 and 120s. The Grendel is slower, but that seems to be a pro with the match bullets. I’ve killed a coyote, a big Muley, a black bear and my wife shot a large bull...all with the amax/Grendel. All were within 100 yards and were anchored very near where they were shot...except the bear which was waaay out there and not ideal. I see that load being great for medium size game out to 400. As always, Shot placement is key and you want to stay away from major bones (stay off shoulders). It seems like a perfect match for pronghorn. Hopefully I’ll be able to draw one in WY this year to see. Amax are discontinued, but the eld match is the replacement. The eldm’s have the same poi in my Grendel as the amax and are just as accurate fwiw. Hornady loads it in factory in there “black line” I believe. If you aren’t into match stuff, sniff around the Hornady SSTs. I’ve read lots of guys like them.
Sounds like a perfect rig for your boy for sure. As you know very little recoil and requires very little powder. 6.5 b.c.’s to boot. If u haven’t tried the xbr with the eldms you might give it a try before you give up on them...not that the other bullets you mentioned wouldn’t also be a good choice. Take care.
Definitely... it's a real head scratcher how those 90s shoot so damn well and the 120s are all over the place. I've got a few rifles in 6.5 so other places to use them rounds if they don't pan out in the gas gun. I'm definitely going to try a few things before giving up tho!
