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Old September 1, 2012, 10:14 AM   #1
Gator Weiss
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22 cal converter for 12 gauge

There is a chamber insert that drops in a 12 bore in which you fire 22 rimfire cartridges. Anyone here ever used one? Can it corrode the shotgun barrell or cause irregular wear and tear? Any opinions?
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Old September 1, 2012, 12:05 PM   #2
Ridge_Runner_5
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I doubt it'll wear or corrode the barrel. However, it'll be less accurate than a musket. You're firing a .22 bullet down a barrel bigger than a .50
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Old September 1, 2012, 12:14 PM   #3
chewie146
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If it's a break-barrel, there are some that have a longer insert that have good rifling. However, aiming becomes a problem still.
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Old September 1, 2012, 07:32 PM   #4
30-30remchester
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I have an older style that is rifled. Mine is capable of 2" groups at 25 yards.
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Old September 2, 2012, 12:58 AM   #5
big al hunter
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You are shooting a .22 bullet down a .79 barrel, it never touches the shotgun bore. Aiming is more instinctive than precise. If you practice it can be surprisingly accurate. Lots of companies have similar conversions for 1911 .45 auto. to .22.
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Old September 4, 2012, 07:07 PM   #6
B.L.E.
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12 gauge is .729" bore, not .79".
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Old September 5, 2012, 12:12 AM   #7
big al hunter
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Unless it is overbored. Every maker has slight differences in bore diameter. Mine is closer to .79 than .729. But .061 .... thats tiny....22 still won't touch the bore. Splitting hairs a little.
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Old September 5, 2012, 05:48 AM   #8
B.L.E.
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I agree that it's splitting hairs but I doubt that any 12 gauge is overbored that much. It would technically make the gun illegal for migratory waterfoul hunting, although most game wardens would probably call it a 12 gauge if it shoots 12 gauge ammo.

13 gauge .710
12 gauge .729
11 gauge .750
10 gauge .775
9 gauge .801
8 gauge .835
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Old September 5, 2012, 07:51 AM   #9
Magnum Wheel Man
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I had some 22 LR chamber inserts made from an old 22 barrel for an antique 30 rim fire revolver... with less than a 1/2" of rifling left, in the inserts after the chambers were put in, it shoots suprisingly accurately, & the 22 caliber bullets don't touch the 30 caliber barrel ( much smaller than a 12 ga )

... so I see no issues shooting the 22 in a 12 ga... other than sighting, & loss of velocity ( if the rifled portion were no longer than a 12 ga shell... of course if it's for a break action, & had a longer barrel, the velocity would be comeasurant with the barrel length )... & with the cartridge being as cheap to practice with as a 22, there is no reason ( since I'd expect it will shoot to a consistant point of impact ) that you couldn't learn where to place the bead for impact at your target
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Old September 5, 2012, 07:31 PM   #10
B.L.E.
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If you live in a unpopulated western state where it's easy to find a place to shoot with no one a mile and a half downrange, this would turn your shotgun into the ultimate practice gun for clay birds, although the lead required for .22LR would be somewhat less than required for a shot gun at the longer yardages.
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