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Browning BCPR 40-65 (Read 925 times)

jmb1948 Newbie Offline Posts: 3 Joined: Feb 8^th, 2025	Browning BCPR 40-65 Feb 10^th, 2025 at 9:31pm	Print Post
	Thanks for your reply Wayne. To be clear, it is a BPCR as evidenced by the 2B7 in the serial number, and first year 1996 production as evidenced by NT in the serial number. There is no BPCR or Miroku marking on the barrel, although it proudly bears "Made in Japan". My cases -- both the resized 40-65 and the mother 45-70, are Starline with .4985 at the web before and after sizing. I do wish the chamber mouth was .508 at that place, as you have experienced. But it seems that it's .0095 smaller that that. I guess grinding the shell holder is the safest next step, if that can work. I'm curious why others don't seem to have the problem. I'd appreciate any thoughts. James


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silver Full Member Offline Posts: 216 Location: Central wi, Joined: Sep 20^th, 2016	Re: Browning BCPR 40-65 Reply #1 - Feb 11^th, 2025 at 8:56am	Print Post
	Could it be a rebarrel ? All original Bpcr browning I’ve seen are All marked mirku on the barrels made in Japan. A pic of barrel Would help.


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ssdave Frequent Elocutionist Offline Posts: 1924 Location: Eastern Oregon Joined: Apr 16^th, 2004	Re: Browning BCPR 40-65 Reply #2 - Feb 11^th, 2025 at 4:06pm	Print Post
	Your experience and the numbers don't line up. A chamber cast is in order, to determine what's going on. Or, if you have the tooling, use pin gauges to determine the actual size of the chamber at the entrance, to verify what the chamber diameter is at the base. I'd 100% suspect a brass or sizing die dimensional problem before I'd suspect a bad chamber on a Browning. It's nearly impossible to cut a chamber undersize on a production firearm!


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texasmac Frequent Elocutionist Offline Posts: 1985 Location: Central Texas Joined: Aug 16^th, 2004	Re: Browning BCPR 40-65 Reply #3 - Feb 12^th, 2025 at 12:34am	Print Post
	jmb1948 wrote on Feb 10^th, 2025 at 9:31pm: Thanks for your reply Wayne. To be clear, it is a BPCR as evidenced by the 2B7 in the serial number, and first year 1996 production as evidenced by NT in the serial number. There is no BPCR or Miroku marking on the barrel, although it proudly bears "Made in Japan". My cases -- both the resized 40-65 and the mother 45-70, are Starline with .4985 at the web before and after sizing. I do wish the chamber mouth was .508 at that place, as you have experienced. But it seems that it's .0095 smaller that that. I guess grinding the shell holder is the safest next step, if that can work. I'm curious why others don't seem to have the problem. I'd appreciate any thoughts. James James, I've never heard of anyone having the same problem nor running into that issue while buying, disassembling over 250 Browning & Win. BPCRs & making chamber cast of many. In the other thread I thought you were resizing .45-70 brass for a .45-70 rifle. Since it's .40-65 the chamber web area should have a diameter in the range of 0.500" to 0.505". Possibly the chamber reamer Miroku used had been sharpened too many times resulting in a smaller diameter. Interesting. Please post how shortening the shell holder works out. An noted in the other thread, taking a bit off the bottom of the resizing die may also be necessary if you'd rather not set the case on top of the shell holder & then punch it out. Wayne
	« Last Edit: Feb 12^th, 2025 at 12:47am by texasmac »

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texasmac Frequent Elocutionist Offline Posts: 1985 Location: Central Texas Joined: Aug 16^th, 2004	Re: Browning BCPR 40-65 Reply #4 - Feb 12^th, 2025 at 12:44am	Print Post
	silver wrote on Feb 11^th, 2025 at 8:56am: Could it be a rebarrel ? All original Bpcr browning I’ve seen are All marked mirku on the barrels made in Japan. A pic of barrel Would help. Silver, None of the rifles are stamped with Miroku on the barrels. All rifles are stamped on the left side with BROWNING ARMS COMPANY MORGAN, UTAH & MONTREAL P.Q., which is centered over MADE IN JAPAN. The right sides of the .40-65 barrels are stamped in a single line with BROWNING MODEL 1885 CALIBER .40-65 BLACK POWDER ONLY. The right side of the .45-70 barrels are stamped BROWNING MODEL 1885 CALIBER .45-70 GOVT, which is centered over RECOMMENDED FOR BLACK POWDER. The right side of the Creedmoor barrels are stamped in a single line with BROWNING MODEL 1885 CALIBER 45-90 BLACK POWDER ONLY. Wayne


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TomKlinger Full Member Offline Posts: 120 Location: Central Florida Joined: Feb 17^th, 2019	Re: Browning BCPR 40-65 Reply #5 - Feb 12^th, 2025 at 7:12am	Print Post
	If the web area is as small as claimed, maybe the barrel was set back a turn and never re chambered. A chamber cast to get dimensions may be needed…. Tom Klinger


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texasmac Frequent Elocutionist Offline Posts: 1985 Location: Central Texas Joined: Aug 16^th, 2004	Re: Browning BCPR 40-65 Reply #6 - Feb 12^th, 2025 at 12:10pm	Print Post
	TomKlinger wrote on Feb 12^th, 2025 at 7:12am: If the web area is as small as claimed, maybe the barrel was set back a turn and never re chambered. A chamber cast to get dimensions may be needed…. Tom Klinger Good thought Tom. It takes a gunsmith to think of that, & Tom's an excellent gunsmith. I would have never considered that. The barrel tenon pitch is 20 threads/inch. So setting it back 1 turn would shorten the chamber by 0.050" which would definitely cause a problem at both ends of the chamber. If that's the cause, shortening the case would also be required. James, if you do make a chamber cast using CerroSafe, Keep in mind that it will enlarge in diameter & length as it ages. Based on experimental data, I have the expansion factors if needed. Wayne
	« Last Edit: Feb 12^th, 2025 at 12:39pm by texasmac »

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semtav Full Member Offline Posts: 102 Joined: Oct 2^nd, 2009	Re: Browning BCPR 40-65 Reply #7 - Feb 22^nd, 2025 at 8:48pm	Print Post
	Just an observation regarding 40-65 chambers. Between my daughter and I, we have 3 40-65s 2 of the rifles have a tighter chamber than the third. The two tight ones have NR 2B7 and NT 2B7 serial numbers. The larger chambered rifle has a NP 371 serial mumber.


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texasmac Frequent Elocutionist Offline Posts: 1985 Location: Central Texas Joined: Aug 16^th, 2004	Re: Browning BCPR 40-65 Reply #8 - Feb 23^rd, 2025 at 11:44am	Print Post
	semtav wrote on Feb 22^nd, 2025 at 8:48pm: Just an observation regarding 40-65 chambers. Between my daughter and I, we have 3 40-65s 2 of the rifles have a tighter chamber than the third. The two tight ones have NR 2B7 and NT 2B7 serial numbers. The larger chambered rifle has a NP 371 serial mumber. Hi Brian, I think I sold you one or more of those rifles. I know I did not make chamber casts. Do you have any data on the dimensional differences between the chambers? BTW, as you likely know, you have a rifle from each of the three years (1996, '97 & '98) they were manufactured. Wayne
	« Last Edit: Feb 23^rd, 2025 at 11:49am by texasmac »

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semtav Full Member Offline Posts: 102 Joined: Oct 2^nd, 2009	Re: Browning BCPR 40-65 Reply #9 - Feb 23^rd, 2025 at 9:19pm	Print Post
	Yea. I sold that first rifle that i bought from you to a neighbor that wanted it worse than me. I think it was the best shooting of the bunch. I realized that last night when i copied the s/ns and got out your book. Interesting that the newest has the biggest chamber. Cant be from resharpening the reamer. That would work the other way. I've never taken the time to see where the difference is. Just keep the brass seperate. Might have to get my prussian blue out and see where the diff is.
	« Last Edit: Feb 23^rd, 2025 at 9:24pm by semtav »

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walnuthill Newbie Offline Posts: 6 Location: woburn massachusetts Joined: Sep 21^st, 2013	Re: Browning BCPR 40-65 Reply #10 - Apr 7^th, 2025 at 8:48pm	Print Post
	RCBS made a special die for Browning 40-65


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