doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com 11ga chamber dimensions

Does anyone know the chamber dimensions for an 11ga?

thanks
binko

I don't have those dims handy but I've just shot an email to Richard B. Hoover asking him for the dims. Either he or I will respond a little later.

Thanks, I just got a 1878 e. james, that weighs 8.6 lbs, and a 12ga shell wobbles a little more than some of my other 12's. It was sold to me as a 12ga, but I'm wondering, most older 12s don't weigh nearly that much, so I'm asking the experts here?

thanks
binko

Rim .835
Base .790
Mouth .782
Length 2.500?
Bore .751

12 gauge bore .729

Measure the bore first and that should tell the tale.

Mike

Thanks skeettx. Your figures look correct.

I am quite pleased you like my figure
Mike

Strange, bore is .721 both barrels, chamber is 3.15" deep, .817 dia., barrel thickness at breech, is .22, and rim is .885. According to bore, it's a 12ga...I guess?

thanks
binko

12 gauge dimensions

Rim .875
Base .805
Mouth .790
Length 2.500? and , and
Bore .729

Modern dimensions for a 12ga call for a minimum chamber diameter of .798" at the forcing cone with a taper of .005" per inch of chamber length. this would give a diameter at the rear of .813" for a 3" chamber. This is "Minimum", add a bit for tolerance & it sure sounds like a 12ga chamber to me. Had this gun been proofed under the old gauge marking system it would have been marked as a 13/1. 13/1 would indicate any bore that would accept a .719" gage but refuse a .729" one. not at all uncommon for a gun with a 12ga chamber.

Well, I guess it's a 12? Imagine that!

Thanks everyone
binko