doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com chamber inserts in 2" twelve gauge gun

Anyone have any thoughts on the wisdom of trying to use a machined downed 12 to 20 gauge chamber insert in a 2" chamber. It would make shooting a two incher way cheaper.
Nial

I'm not positive the front part of the insert would have adequate strength to resist essentially peak chamber pressure. I'd sure run that past the manufacturer before just proceeding with the modification. 2" guns are often very light weight and have some pretty dramatic barrel contures in front of the chamber to help with the weight loss.

Why not just reload?

I would prefer to use a modified 12 to 28 insert machined to use the full length of the insert with more thickness at the forcing cone area, or, better yet, get Briley to make you a full length set of inserts custom made to 2" chambers and including screw in chokes in the tubes. It's only money, and one set of Brileys is only about $400. Yes, I use them in double guns.

You might want to call Gauge Mates to discuss your idea. I called them a couple of years ago to ask about cutting down a set of 2-3/4" 16-to-20 inserts to use in a 2-1/2" Damascus 16. They were quite helpful.

Wouldn't you still have to shoot 2" 20 ga. shells? JL

JL - the idea is that a 20 gauge will go into the forcing cone and barrel of a 12 gauge gun. On the 2" chamber, it would have to if one was going to use longer hulls. The issue is whether there would be sufficient "meat" in the insert to deal with what might be near peak chamber pressure when the insert is chambered 2 3/4" and then adapted to a 2" 12 gauge chamber on the outside - obviously, the forcing cone reduction to bore diameter is 3/4" further back than when the 12 gauge chamber is 2 3/4". The front of the adapter is going to be pretty thin. Also, there might be higher pressure on the rapidly thinning barrrel walls of the 2" gun.

Don, that is why I suggested the 28 gauge insert rather than the 20. We need more thickness than the 20 gauge insert will offer.

Should be alright but the 12 to 28 makes more sense and it easier. Why take any risk when you do not have to? The 12 to 28 I am sure will work and be fine while the 12 to 20 should be OK. Not very much metal in the forcing cone area of a Chambermate turned down to fit a 2" chamber. Would not be surprised to have one crack if you remove too much metal. They will be very thin.

You'd loose the advantage of it being a 2" gun.
I'd reload for it.