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RJ-35-40
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375 Winchester Brass
Jun 8th, 2026 at 1:18pm
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Some time ago I recall someone saying they use 375 Winchester brass as the parent case for another cartridge but I can't recall what that cartridge is.... Anyone else use it as a parent case for another cartridge other than 375 Win...?

My understanding is that it can be used as a case for 38-55 and due to it's reported thicker web it can hold higher pressures than the standard 38-55 case. 

Any thoughts.. Ferris...?
  
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calledflyer
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Re: 375 Winchester Brass
Reply #1 - Jun 8th, 2026 at 1:51pm
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you could form any of the cases chambered in the model 94 from .25-35 to that ol' .375 if you want to go to the trouble. 
as far as those cases absorbing higher pressure... I'd like to see a sectioned hull compared to, say, a .30-30. before the cutting I'd wager that they just ain't any difference. and, the gun is more the concern as to high pressure anyhow.
  
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marlinguy
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Re: 375 Winchester Brass
Reply #2 - Jun 8th, 2026 at 2:28pm
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If you used it for .32-40 or .38-55 the brass will be short.
  

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bullshop
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Re: 375 Winchester Brass
Reply #3 - Jun 8th, 2026 at 3:26pm
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Dont believe everything you hear. Sectioned cases for all cartridges based on the 30-30 size case head are all the same, at least all that I have seen.
The heavier or thicker web in the 375 win case was a myth, an advertising hoax to boost sales. 
  If the web was thicker then the internal case volume would be reduced.
I believe the original big bore 94 had some extra steel (wider) behind the locking lug.
  
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jimmy
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Re: 375 Winchester Brass
Reply #4 - Jun 8th, 2026 at 3:38pm
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I have some 7mm international rimmed cases someone formed from 375. They were cheap. Haven't tried loading them yet.
  
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oneatatime
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Re: 375 Winchester Brass
Reply #5 - Jun 8th, 2026 at 4:41pm
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Back when I had an FFL I bought a new American Bald Eagle Commemorative 375 from the distributor and kept it for a year or two in the box and then sold it to a friend for $300.
Bet it is worth more than that now.
  
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Skalkaho
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Re: 375 Winchester Brass
Reply #6 - Jun 8th, 2026 at 7:36pm
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You'll drop about 6 or more grains of water using as a 32-40 sized down.It is beefier A 375 Starline brass weighs 158.40  give/take
Winchester 38-55 weighs 137.80 give/take.   Do the math,have fun. Been playing with this brass since it came out and I bought a win 375 Big bore Carbine in 1979,was my pack around gun while in  Alaska logging camps back then. Ya I got razzed by guys on the gun...but at least I HAD A gun in my hand while in the bush fishing and they didnt..LOL...so shoot them in the foot if a Brownie charges and run....
  

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bullshop
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Re: 375 Winchester Brass
Reply #7 - Jun 9th, 2026 at 10:25am
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375 win in a Marlin model 375 was one of my carry guns in Alaska too. I loaded mine with a 350 grain LBT-LFN bullet to 1550 fps. Cast hard that load penetrated well.
  For some odd reason that I never understood Winchester techs stayed with the traditional 1/12" standardized by the 375 H&H rifling twist rate for their 375 Big Bore. They never offered any factory ammo loaded with a bullet weight anywhere near what the 1/12" twist will handle.
  We know that the 375 H&H was loaded with a 350gn bullet option so I felt motivated to try.  The 375 Win cant get close to the velocity of the H&H but the LBT 350gn LFN bullet being a homogenous alloy is shorter than its jacketed counterpart so requires les rotational velocity to be stabilized. It was a good match to the cartridge for a bone crushing deep penetrating load.  Still available too.
  
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85lc
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Re: 375 Winchester Brass
Reply #8 - Jun 9th, 2026 at 3:16pm
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I thought the 375 Winchester was an excellent deer cartridge.  Unfortinately, the gun writer press didn't praise it enough and it died. 
I have a TC with 14" barrel and enjoyed shooting it with a 235 gr bullet.  Of course, I never recovered a bullet as all were pass thrus. 
I have used 375 Win brass for 7mm Merrill and 30mm Merrill cartridges.  
The 375 Win brass that I sectioned was thicker than the 30WCF brass I sectioned. 
  

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marlinguy
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Re: 375 Winchester Brass
Reply #9 - Jun 9th, 2026 at 4:26pm
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bullshop wrote on Jun 8th, 2026 at 3:26pm:
Dont believe everything you hear. Sectioned cases for all cartridges based on the 30-30 size case head are all the same, at least all that I have seen.
The heavier or thicker web in the 375 win case was a myth, an advertising hoax to boost sales. 
  If the web was thicker then the internal case volume would be reduced.
I believe the original big bore 94 had some extra steel (wider) behind the locking lug.


The '94 in .375 had chubby sidewalls at the rear to give more metal around the locking lugs.
  

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joelpend
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Re: 375 Winchester Brass
Reply #10 - yesterday at 10:46pm
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I used the Starline 375 Win to make 8.15x46R cases. Like previous poster stated it is thicker and less case capacity compared to the Starline 38-55 so I thought that a positive for my 8.15x46R.
  
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