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Trapdoor carbine chamber & bore dimensions

Posted by Wayne McLerran on Sunday, 16 January 2011, at 5:00 p.m.

I finally got around to Cerrosafe casting the bore of the 1877 stared carbine that Al sold me a few years ago. I thought some of you may be interested. The rifle was in pretty rough condition when I bought it from Al, but the bore was in good shape. I cleaned it up a good bit some time ago and plan on using it to take a deer or two the next hunting season. In order to make accurate loads for any black powder cartridge rifle (BPCR) one needs to know the chamber and bore dimensions. Using a v-anvil micrometer due to the 3-groove design, the groove diameter of the bore measured 0.4642”. The bore diameter is 0.4518”, chamber neck diameter is 0.485” and the overall chamber length is 2.105”.

You may be interested in several articles I’ve written on BPC rifles. If so go to Although some of the articles are focused on Browning and Winchester BPCRs, several will apply to any BPCR. Some of the titles are: CASE STRETCHING AND SEPARATING IN BLACK POWDER CARTRIDGE RIFLES SHOOTING SHORT-CASE CARTRIDGES IN BPCRs – MYTHS & FACTS STRETCHING SHORT BRASS TO FIT YOUR BPCR CHAMBER A DISCUSSION ON CHAMBER LENGTHS, CHAMBER CASTS & IMPACT IMPRESSIONS



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