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Mar 29th, 2024
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Joined: Jan 2002
Posts: 2,522
Sidelock
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OP
Sidelock
Joined: Jan 2002
Posts: 2,522 |
Group was having a discussion regarding over boring of various guns. I haven't been able to find what an overbored 10ga and 12ga gun might measure. Is there a standard for this or is this dependent upon the manufacturer?
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Joined: Feb 2002
Posts: 14,111 Likes: 195
Sidelock
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Sidelock
Joined: Feb 2002
Posts: 14,111 Likes: 195 |
I have been fooling with shotguns for nearly sixty years and I still don't know the difference between overbored barrels and backbored barrels. Is it the same thing?
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Joined: May 2010
Posts: 1,524 Likes: 73
Sidelock
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Sidelock
Joined: May 2010
Posts: 1,524 Likes: 73 |
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Joined: Jan 2002
Posts: 2,174 Likes: 39
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 2,174 Likes: 39 |
I'd say backbored or overbored are one and the same, and refers to something exceeding whatever is considered standard bore diameter.
As far as dimensionally speaking I don't think you can pin in down to one diameter. My SC gun is .750 but I've seen overbored barrels that measure up to .810 (12 ga that is.)
Last edited by Ken Nelson; 05/24/13 02:37 PM.
Dodging lions and wasting time.....
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Joined: Feb 2006
Posts: 3,726 Likes: 49
Sidelock
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Sidelock
Joined: Feb 2006
Posts: 3,726 Likes: 49 |
L.C. Smith 10 gauge guns from the early Smith Baker, Syracuse, N.Y. seem to be close to .800 bore. Hunter Arms Co, Fulton, N.Y. 10 gauge bores were listed at .775 and seem to be a +/- .002.
12 gauge from Hunter Arms are .729 again +/- and I have some hammer guns in the .724 bore size. Hammerless seem to be close to .728-9.
Some of these early guns, if you want to call them back bored, but a better term is honed.
I was typing this as Ken Nelson posted his, and I would be concerned with a 12 ga. at .800.
Last edited by JDW; 05/24/13 02:33 PM.
David
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Joined: Jan 2002
Posts: 2,174 Likes: 39
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 2,174 Likes: 39 |
To clarify,
The .810 bore was on an Baker Big Bore trap gun barrel.
Ken
Dodging lions and wasting time.....
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Joined: Jan 2011
Posts: 199
Sidelock
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Sidelock
Joined: Jan 2011
Posts: 199 |
Modern Browning/Miroku factory "backbored" is a nominal .740"
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Joined: Feb 2003
Posts: 1,624 Likes: 13
Sidelock
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Sidelock
Joined: Feb 2003
Posts: 1,624 Likes: 13 |
Pardon my ignorance but wouldn't BACKBORING be the result of leaving the choke area as is and then OVERBORING from the breech end up to that point to achieve choke? Overboring could also be done straight through the bore without back boring. It is entirely possible that my understanding is wrong.
[IMG]
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Joined: Feb 2002
Posts: 14,111 Likes: 195
Sidelock
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Sidelock
Joined: Feb 2002
Posts: 14,111 Likes: 195 |
Boring all the way through the choke wouldn't make a lot of sense.
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Joined: Mar 2002
Posts: 7,710 Likes: 474
Sidelock
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Sidelock
Joined: Mar 2002
Posts: 7,710 Likes: 474 |
Some of the early Lefever were bored to what we consider over bored size. I had one that was a perfect .750 bore with walls that were .045 at their thinnest point. Heck of a heavy water fowl gun with chokes that were .045 or .050 as I recall. Have a Baker with .7550 bores that are .050 thick and comes in at 9 plus pounds.
Never got to use the Lefever on one ducks or geese. I did shoot one mallard with bismuth shot with the Baker at a range that still impresses my son for a long shot. I wish that we could get a one day a year lead shot season with classic double guns or pay a yearly special lead use permit to shoot classic doubles.
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