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Old February 1, 2013, 01:37 PM   #1
publius
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overbore barrel

Does anyone besides Mossberg make an auto with the large bore barrel? thanks.
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Old February 1, 2013, 02:03 PM   #2
BigD_in_FL
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IIRC, Beretta does, at least on some models
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Old February 1, 2013, 09:55 PM   #3
tjh
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Browning says thier barrels are back bored , is that the same thing you talking about .
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Old February 1, 2013, 09:57 PM   #4
zippy13
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IIRC, my R-1100 Trap gun is overbored.
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Old February 2, 2013, 01:19 PM   #5
publius
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No, what I'm talking about is the 10 ga. barrel on the Mossy 835/935.
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Old February 2, 2013, 03:30 PM   #6
Virginian-in-LA
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You do not have a 10 gauge barrel on your Mossberg unless you have had some extensive gunsmithing done. Overbore or backbore usually refers to barrels that have an inside diameter larger than the standard for that gauge. There have been, and are, factory examples produced by several manufacturers. Many gunsmiths offer the service. The merits are usually a source of debate. I got slightly increased velocities with some loads, and a marginal increase in pattern efficiency with several barrels I had backbored.
If you get too big, most plastic wads I have seen start running in to sealing issues. If you have too little or the wrong powder, you can lose a little velocity.
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Old February 3, 2013, 08:51 PM   #7
B.L.E.
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I would think that if you overbored a 10 gauge barrel, it might technically become illegal for migratory bird hunting, though most game wardens would probably call it a 10 gauge if it shoots 10 gauge shells.
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Old February 4, 2013, 04:16 PM   #8
BigJimP
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Why ?? - or what are you trying to do ??
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Old February 5, 2013, 03:21 AM   #9
Dreaming100Straight
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I do not know how current this is but per Mossberg
Quote:
* * * 935™ and 835® 12-gauge barrels are overbored to 10-gauge dimensions
and see this:

Quote:
12-GAUGE MUZZLE COMPARISON: (.775) Overbored 12-gauge 835 Ulti-Mag barrel (left) -vs- our standard (.731) 12-gauge barrel (both barrels are shown with flush-fitting choke tubes installed).
Still, I am not sure that is a true 10 gauge bore as I believe a 10 gauge is a .779" bore diameter. but what is .004"?
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Old February 5, 2013, 07:06 AM   #10
Virginian-in-LA
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Yes, the bore diameter is nominally a 10 gauge, but it is an overbored 12 gauge barrel, not a 10 gauge barrel, was my point. Back when I was experimenting I found I couldn't get good wad sealing over about .742". "Wasted" 2 barrels in the process. I was not dealing with 3-1/2". I have not heard any bad reports on the Mossbergs, so I wonder if the manufacturers have modified the wads, or if some wads do better than others.
The early 3-1/2" 12 gauge BPSs were built on the 10 gauge receiver, and a guy who had a 12 borrowed my 10 and said the barrels would swap. I don't know if the gun would have functioned or not. I do know that was a heavy 12 gauge if it did.
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