Greener 12/14 shotshells

woodchopper

woodchopper

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anyone have drawings of the Greener MkIII 12/14 shotgun chambers?

I'm wanting to make an adaptor and use 16 or 20 gauge shot shells.

It's either that or I'm going to have to do a permanent barrel swap and modify the extractor.
 
well now I'm scratching my head a little more.

in my reading I came across a comment that the MkIII greeners in 14/12 are really just a 12 gauge cylinder bore barrel with a super short 12 gauge chamber. I thought WTF so I pulled out my greener and low and behold I can drop a dime through the entire barrel.

so that opens up the option of just reaming it for a 12 gauge 2 3/4 shell.... IF that would fit with the block.

The alternate is to make some forming dies and use 12 gauge brass shot shells.
 
Good to have options! Sounds like a fun project to puzzle out. Wonder how many of these are still around.

From the manufacturing standpoint it makes sense to build them that way. The idea of using a bottle neck shotgun shell is appealing to me but reaming to a standard chamber would be much more simple in the long run.
 
yes options are good, I would like to keep it original if I can.

I was under the impression that the bore was 14 gauge or 14 1/2 gauge but now thinking of the manufacturing process it makes sense that Greener would just use 12 gauge barrels and the odd chambering, cheaper and easier.

there must be a few of these kicking around, but finding any information about them is not always easy.
 
Brass is available from Rocky Mountain Cartridges, about $9/each

gp3y-1.jpg
 
Nominal bore diameter is reported to be 0.702 - about 13 gauge, and significantly under 12 gauge.
I owned one that had been bored with an expansion reamer, not well done, and rechambered.
 
sillymike said:
Just thinking out loud: But I'm wondering if someone could make chamber adapter, to slip over the 12g round?
Click to expand...

I was thinking of making one that would allow me to shoot 16 gauge.

a 12 Gauge round is too big to start with so no adaptor will work for that.


and Yes I saw that Rocky Mountain Cartridges was advertising turned brass cases, but at $9/ea I thought I could do something cheaper, just need to get the lathe moved out to the new place and set up.
 
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