What is the bore diameter of a 38-55 ?

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BenT
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What is the bore diameter of a 38-55 ?

Post by BenT »

I checked with Numrich today on their 38-55 octagon barrel that is threaded and reamed for a 94 win. Since no bore diameter was listed I asked and the gal said .369 bore. I also checked on the 38-55 barrel on sale at Buffalo arms and no bore diameter is listed.
Now I want to shoot both cast and jacked bullets. So .369 seems a little small to shoot .375 jacketed bullets in. So I'm looking for clarification. Thanks.
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Big Bore 94
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Post by Big Bore 94 »

Ben T, I just used a micrometer on my 26" octagon Numerich barrel .369. My 1896 vintage Winchester 1894 comes away with .370. These measurements are by micrometer. This is not slugging the barrel, but a quick reference. I just put a new Ultramax cast bullet into the bore. .072 was between the end of the cartridge case and the end of the bore. Using this cast bullet .377. I have had this barrel for a long forgotten project and would gladly sell this barrel to you or anyone else needing a new old stock 38-55 Numerich barrel for a Winchester 94.
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BenT
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Post by BenT »

I would be interested in it if the .375 jacketed bullets are O. K. to be used in this bore. I'll wait till I can get more info from this thread.
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Hobie
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Post by Hobie »

Bore or groove diameter? Bore might be .369... :wink: If it slugs .377 you're good to hook.
Sincerely,

Hobie

"We are all travelers in the wilderness of this world, and the best that we find in our travels is an honest friend." Robert Louis Stevenson
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BenT
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Post by BenT »

Big Bore , I figure .369 bore makes sense if grooves are .003 deep that would put it at .375.
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390
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Post by 390 »

I shoot a Winchester Crazy Horse in 38-55. It slugged at .378. I shoot beartooth bullets at .379, 265 grainers.
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BenT
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Post by BenT »

Well I slugged the bore on the Numrich barrel today and it slugged at .375.
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homefront
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Post by homefront »

My Marlin CB is .381.
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bj94
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Post by bj94 »

I think .375's are usually .375 or real close, but .38-55's are likely to be .378 or bigger.
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KirkD
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Post by KirkD »

The original Winchesters had a groove diameter closer to .380. I have two. A rifle made in 1899 has a groove diameter of .382 and a SRC made in 1907 has a groove diameter of .379.
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admiral
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Post by admiral »

390 wrote:I shoot a Winchester Crazy Horse in 38-55. It slugged at .378. I shoot beartooth bullets at .379, 265 grainers.
my crazy horse has a bore of .373" and groove of .380". it is unbelievable how 38-55's run all over the place.
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