Educated Guess on Starting Load

[SAWMAN]

I have been shooting this NEF Handi Rifle chambered in 500S&W Mag for some years now. The bbl has been chopped to 18 inches and LOP taken down to 12.75 inches.It wears a 2.5X Leupold with heavy duplex.
I have tried quite a few different loads with this gun including the 350gr and 500gr Hornady XTP's. My hunting load is a 440gr WFNGC (hardcast) and I have several loads shooting lighter bullets at <850fps which are great fun on steel.
The 500 in a single shot action is great fun. The gun in the middle is the 500. Bottom gun is a 444Marlin and top gun is a 45-70.
Hopefully you can get you AR running properly at the >50K psi pressures.Personally,if it were my gun,I would shoot only jacketed bullets thru it. If it has adjustable gas that should help with the "tune" greatly.
What is the actual chambering of your gun ?? 50Raptor ?? 500S&W without a rim,right ?? --- SAWMAN

[tabascoman]

I have been shooting this NEF Handi Rifle chambered in 500S&W Mag for some years now. The bbl has been chopped to 18 inches and LOP taken down to 12.75 inches.It wears a 2.5X Leupold with heavy duplex.
I have tried quite a few different loads with this gun including the 350gr and 500gr Hornady XTP's. My hunting load is a 440gr WFNGC (hardcast) and I have several loads shooting lighter bullets at <850fps which are great fun on steel.
The 500 in a single shot action is great fun. The gun in the middle is the 500. Bottom gun is a 444Marlin and top gun is a 45-70.
Hopefully you can get you AR running properly at the >50K psi pressures.Personally,if it were my gun,I would shoot only jacketed bullets thru it. If it has adjustable gas that should help with the "tune" greatly.
What is the actual chambering of your gun ?? 50Raptor ?? 500S&W without a rim,right ?? --- SAWMAN

It’s probably the 500 auto max


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[BradyT88]

I have been shooting this NEF Handi Rifle chambered in 500S&W Mag for some years now. The bbl has been chopped to 18 inches and LOP taken down to 12.75 inches.It wears a 2.5X Leupold with heavy duplex.
I have tried quite a few different loads with this gun including the 350gr and 500gr Hornady XTP's. My hunting load is a 440gr WFNGC (hardcast) and I have several loads shooting lighter bullets at <850fps which are great fun on steel.
The 500 in a single shot action is great fun. The gun in the middle is the 500. Bottom gun is a 444Marlin and top gun is a 45-70.
Hopefully you can get you AR running properly at the >50K psi pressures.Personally,if it were my gun,I would shoot only jacketed bullets thru it. If it has adjustable gas that should help with the "tune" greatly.
What is the actual chambering of your gun ?? 50Raptor ?? 500S&W without a rim,right ?? --- SAWMAN

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.

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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