doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com 12 gauge inserts in a 10 gauge

If you can't shoot a shotgun, the .410 is an abomination. On the subject at hand, a 12 gauge shell shot in a .775 ten gauge bore should perform just fine, since many modern (and many antique) twelve gauge barrels are bored at .750 or better. I have not experienced any of these off sound reports in 12 gauge shells fired in Chambermates. On the other hand, I don't use any slow burning powders in 12 gauge target loads. Such loads, especially when fired in ten gauge bores, should be loaded with fast powders like Red Dot and 700X to keep the pressure and the sound up to specs. I hope my friend Sam benefits from my comments.

Haven't used a chamber insert in 10-12ga. I have used one ounce 10ga 2 7/8" handloads in a Diamond grade Lindner which was choked very tight. The one oz loads were powdering trap targets from the 27 yard line. I think the pattern must have had an extremely short shot string to get the really dramatic breaks at that range.

Thanks, Miller,

You are of course quite correct about the nominal bore dia. for the 11ga. That's basically what Baker played with. I should have been more pacific. Ha!

Also agree w/your assessment on the extra long forcing cones.
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.410's are fun for shots inside 25~28 yards, provided you hit the target. Witnessed a number of pheasant taken over dogs a few years back by a young man of eleven shooting a 000 framed Parker .410 that was ordered by a friend's grandfather for his dad to learn to shoot with. 3" #6's in 2.5" chambers, FWIW. No one had ever given it a thot, JIC anyone here might ask. I've shot a few dove at stupid ranges w/a full choked model 42 and some other .410's, but I've patterned them as well and know what luck is. Perfect .410 scores at NSSA shoots could be counted on one hand in the early 60's, but they didn't have tubes or one piece plastic wads. Charlie Polton(sp?)was shooting basically 3/8oz. paper.410 loads when he set his skeet records. The ammo was mislabeled in them days.

edit: I think there were actually six perfect NSSA .410 scores on the books in 1960 or 1961, but I could be wrong.

I have been very happy with GaugeMate Gold adapters (10-12). Too bad if they don't make them any more. I am not sure their website is up-to-date, but I just took a look and there is a tab on custom sub-gauge adapters, which might be a possibility if the cost is not out of sight.

I'm not trying to hijack this thread but I believe this is along the same lines. Has anyone here ever had or seen a gun rechambered to a smaller gauge? I recently picked up a 10 gauge Smith and I want to convert it to a 12. Has anyone here had this done?

I have seen at least one gun that had been chamber sleeved. I think it was an L C Smith 12 sleeved to 20, and I recall that it seemed pretty heavy.

I have a 16 that was sleeved to 20 years ago. It was a light frame 16 and finished up a nice swinging heavy 20. Bigger drop in gauge probably not a good idea. I like it a lot but expensive conversion if done today. Better to buy a 12 than sleeve in most cases..

Or you can load 2 7/8 inch 1 1/8 oz and 1 oz light 10's that work very well. Perform like light 12"s. Not a lot of trouble once you get set up.

Boats

A bit Nit-Picky I know but to go to a smaller chamber one does have to chamber sleeve, one cannot "Re-Chamber" to a smaller size. Re-chambering will always remove metal, not add it.

I have been told that Jon Hosford has "chamber sleeved" some 14 gauge guns to shoot 16 gauge with a glued in and removable thin sleeve. I have not seen an example, but one sold on GI recently.

To keep the terms straight, my 16 to 20 was barrel and chamber sleeved the whole thing. Lugs and ribs original rest new. Ended up about 8 oz heavier than when it was a 16 from best that I can guess. 16 that was probably too light to swing good to a 20 that has a lot of barrel weight and swings very good. Not the gun for everybody though.

Boats