I was in search of one of those Handi Rifles for a while but they had been discontinued and used models were going for more than they ever sold for new so I didn't really want one that bad I guess. Some time later Big Horn Armory announced their AR500 chambered in 500 AutoMax and the price seemed pretty reasonable to me so I pre-ordered one.Originally Posted by SAWMAN
I've ran some pretty hot loads through it already. I bought some factory ammo from Underwood to initially test out. 350gr XTP's rated at 2300 fps. I shot 10 of them the first time I took it out with no problems. Thy chrono'd just a hair over 2300 fps. Bought a different scope mount and took it out in July and zeroed the scope again. Ambient temps were in the high 90's. I would shoot a round, the next one would get chambered and be sitting in the chamber while I was looking through a spotting scope at the target. Since I previously hadn't had problems, I didn't have the chrono out nor was I checking brass. I blew 5 primers out of the 7 rounds I shot. One of the primers jammed into the star chamber with the next round and I had a pretty hard time getting it back out. Spoke with Underwood and BHA about it. BHA wasn't worried about the rifle. Only the bolt face if I fed it a steady diet of those. Underwood was surprised though. They said they thought they had done a good heat test of the rounds when they would shoot hundreds at a time through the rifle rapidly. When they recreated what I explained they ended up with the same result as me though and reworked their load and sent me new ammo. Their load was apparently good until you shot a certain way on a really hot day.
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