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Old March 16, 2020, 11:47 AM   #1
45flaco
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375 H&H Mosin

Hey guys. Recently bought two mosin barreled actions, both with sewer pipe barrels. I happen to own 2 0.375" barrel blanks, and the equipment to load 375 H&H.
My plan is to put the blanks on the mosins, and chamber to 375 H&H for one, and 375 winchester for the other. The H&H is going to likely be a single shot, as I tried to fit one in the mag, and it didn't even come close to fitting, although a 300 Win mag will.
I plan to usually load around 375 flanged mag pressures, and only use the full power stuff for hunting.


I found that the blanks need to be threaded 1x16 TPI to fit the mosin receiver, by trying to thread random barrels into a spare receiver stub until one fit (ruger M77). This part should be relatively easy.

My other problem is bushing the bolt for the smaller rim diameter of the H&H. I've bushed a bolt before, but it was a much larger difference.
In this conversion, I will need to go from a 0.565" rim to a 0.535" one. That is a very small difference, but nowhere near small enough to ignore. The only time I have ever bushed a bolt was going from a 0.473" to a 0.378", a much bigger difference.

Ideas, suggestions?
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Old March 16, 2020, 12:43 PM   #2
Jim Watson
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Can you get .375 Flanged brass? Rim diameters are close.

If it is going to be a single shot, it would look nice if you discarded the bottom metal/magazine and put on a plain trigger guard.

Last edited by Jim Watson; March 16, 2020 at 01:39 PM.
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Old March 16, 2020, 04:37 PM   #3
SHR970
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Instead of 375H&H have you considered your own version of the 375 Chatfield -Taylor? If a 300WM will fit chances are good that this will too.....and you can easily achive 375H&H power levels with it.
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Old March 16, 2020, 05:20 PM   #4
Jim Watson
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9.5x54R would be a natural but reamer and dies would run up the cost.
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Old March 25, 2020, 09:35 PM   #5
45flaco
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I had considered the 375 flanged, but like with the other cartridges mentioned, brass was the main drawback. I can get once-fired 375 H&H brass for right around a dollar a round locally, whereas the flanged brass is over 3 dollars a round at best. The other ones don't have available brass at all. I did originally consider 9.5x54r, but the complete lack of support for it stateside ruined that. One of the attractions of 375 H&H is that I know of 4 places locally that carry it. While I plan to reload, I do really like having guns that I can buy factory ammo for locally.
I will look into the Chatfield-taylor, but I suspect ammo or brass for it is going to be similar or worse than the 375 Flanged situation.
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Old March 25, 2020, 09:36 PM   #6
45flaco
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I was already planning to ditch the bottom metal, and hoping to make a trigger guard that looks similar to the old SxS shotguns, that goes back with the stock a ways, and curves around at the front. Much better look than the military mag box.
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Old March 26, 2020, 03:31 PM   #7
Paul B.
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"Instead of 375H&H have you considered your own version of the 375 Chatfield -Taylor? If a 300WM will fit chances are good that this will too.....and you can easily achieve 375H&H power levels with it."

I was going to suggest the same thing but you beat me to it. I like mine very much and it's quite accurate.

"I will look into the Chatfield-taylor, but I suspect ammo or brass for it is going to be similar or worse than the 375 Flanged situation."

Ammo is no problem. I've made brass for mine with everything from 7MM Rem. Mag. (last choice BTW) to .458 Win. Mag. (first choice.)Easiest is either use the base .338 Win. Mag. brass and just neck up or my preference, .458 Win Mag. brass Either will work with one pass through the sizing die with a very slight trim of the neck to insure the necks are square. IIRC, there is a place that makes brass with the proper head stamp but unless you're hunting out of country where head stamp and barrel stamp must match it's not something to worry about.
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Old March 26, 2020, 08:17 PM   #8
SHR970
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If you insist on factory ammo as an option go 375 Ruger and call it a day.
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375 h&h , barrel swap , bolt bushing , mosin , rim diameter

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