Chamber and Caliber Conversions?

[ButchS1066]

bump...

Come on, I know someone has a set of calipers and a couple shotgun shells handy...

Measuring shotshells would be the wrong way to go about it, you really need chamber measurements. Something like these.

[eocoolj]

Thank you butch! This is a very helpful table. Any idea how far undersized to make all the respective dimensions for making the insert? Don't want it to be an ultra-tight fit.

[ButchS1066]

The more I research into it, the less comfortable I am discussing it.

The problem is the .410 bore operates at higher pressures than the 12 guage in all but the 3 1/2" shells. You'd only have to fuck up a little to spike the pressures up past where the barrel bursts, and I don't want to get sued.

[Denis]

eo,

look up Roy Dunlaps' book Gunsmithing on Google Books. On pages 307-309, you'll find shotgun chamber and cartridge diagrams with dimensions.

Notes.png

Here they are too.

.410

410GA.png

20-Gauge

20GA.png

[Denis]

16-Gauge

16GA.png

12-Gauge

12GA.png

Hope that helps. the book is a mine of information. It's worth picking up a used copy, if you can.

IIRC CIP table VII also gives the specifications for shotshells. If you still want that, PM me, as I'll have to dig it out...

[The Wizard]

Hope that helps. the book is a mine of information. It's worth picking up a used copy, if you can.

IIRC CIP table VII also gives the specifications for shotshells. If you still want that, PM me, as I'll have to dig it out...

quick Denis, edit it before the Grammer Nazis get you!!! (/off topic)

(on topic/)
Hey thanks for all the replies everyone, im going to edit my original post to include all the links for the adapters(/on topic)

continue as you were