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Old January 18, 2023, 09:43 PM   #1
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Join Date: November 19, 2017
Posts: 134
Semiauto 375 H&H Runs! 458 Lott Barrel in the works

Hey guys,
The 375 H&H AR has been updated with an adjustable gas block and heavier buffer, which has solved the stock breaking issue.
Fired a bunch since then, decided it's working satisfactorily, and now I'm planning a .458 Lott upper and barrel.
all that really needs swapped is the barrel, but I like the 375 enough that I'd rather keep it on it's own upper to swap back to occasionally.

Link to a video of the test rounds with new gas block and buffer below, it shot stupid smooth. Ammo used was a mix of exceptionally spicy handloads with the 200 grain sierra, and PPU 300 grain factory soft point. The 200 grain load has slightly more recoil, but was still quite manageable.
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Old January 18, 2023, 09:50 PM   #2
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And yes, I know it looks overgassed because it's ejecting shells forward.
But this thing has a ridiculous amount of dwell time, and a very heavy buffer for reliability reasons. That bolt needs to move faster than an AR-10 bolt, because it needs to travel further (by a little more than an inch). The force to unlock and initially extract is quite a bit heavier. I've added about 6 ounces to the reciprocating mass, and this is where the perfect reliability is.
One of the few things that I do wish I'd been able to do differently would be the use of a roller cam pin, and some sort of fancy coated bolt head to reduce friction.
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375 h&h , 458 lott

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