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Apr 27th, 2024
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Joined: Jan 2017
Posts: 337
Sidelock
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OP
Sidelock
Joined: Jan 2017
Posts: 337 |
I have a hammerless antique English 12 bore with a chamber that is too tight to fit a standard 12 gauge shell, but too large for a 16 gauge shell.
I thought perhaps 14 gauge but the bores measure .735/.735.
Any thoughts? Brass shells only maybe?
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Joined: Jan 2002
Posts: 7,703 Likes: 103
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 7,703 Likes: 103 |
Maybe a candidate for chamber sleeving down to 16ga?...Geo
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Joined: Dec 2001
Posts: 6,993 Likes: 402
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 6,993 Likes: 402 |
Proof marks or a chamber cast would be a good place to start.
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Joined: Mar 2002
Posts: 7,718 Likes: 479
Sidelock
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Sidelock
Joined: Mar 2002
Posts: 7,718 Likes: 479 |
Could it be for a thin brass case? .735 is a 12 bore or maybe a 12/1 bore. What do the chambers measure? A 12 should be .812 tapering to .800 give or take a few thousand. 14 is .775 and .763 with bores .693.
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Joined: Jan 2002
Posts: 737 Likes: 23
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 737 Likes: 23 |
Show us a photo of the proofmarks on the barrel flats.
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Joined: Dec 2001
Posts: 12,743
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 12,743 |
Most" brass cases fit the same chamber as do paper cases. There were a few made with undersize chambers for smaller cases but they are extremely rare.
At least these were cataloged in the US, can't say for certain if any were made in England or not.
Miller/TN
I Didn't Say Everything I Said, Yogi Berra
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Joined: Oct 2014
Posts: 312 Likes: 1
Sidelock
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Sidelock
Joined: Oct 2014
Posts: 312 Likes: 1 |
Bore size isnt all that relevant; do a chamber cast and put a picture up of the proof marks and get someone to measure it properly with a shotgun bore micrometer or plug gauge 9" from the breech
Is there a visible end to the chambers or can you see a forcing cone? Chamber-less guns were experimented with usually designed for use with brass cases.
Bore size is almost irrelevant, ive seen 12 bores which were 11 in the bore, and 12 bores that were 16 in the bore. You could just as well have a 14 bore
The diameter at the breech should be around .812 for a 12 bore and about .775 for a 14 bore. Make allowances for wear and manufacturing error and such.
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Joined: Feb 2002
Posts: 14,125 Likes: 198
Sidelock
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Sidelock
Joined: Feb 2002
Posts: 14,125 Likes: 198 |
How about trying a 14 gauge shell in the chamber, a lot cheaper than taking a chamber cast.
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Joined: Jun 2002
Posts: 2,266 Likes: 93
Sidelock
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Sidelock
Joined: Jun 2002
Posts: 2,266 Likes: 93 |
I guess the length of the shell wouldnt matter? As if the gun has short chambers.
Last edited by battle; 05/10/19 01:27 PM.
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Joined: Jan 2017
Posts: 337
Sidelock
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OP
Sidelock
Joined: Jan 2017
Posts: 337 |
The gun is marked 14B over 15M.
So clearly this is a 14 gauge that has been over-bored. Which I guess wasn't that uncommon.
Thanks for the replies.
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