Thread: Shotgun-9mm thing

Originally Posted by Toby

So my calculation is right by vc and wrong by banana? I got the measurment off chuck hawkes which is different to bananas

No doubt that I'm off with the case head measurement. I just roughly measured a 12g with crappy plastic ruler and rounded it to the nearest mm. The working should be solid though.

If you're using 0.6165" as the case head area, seems like you're including the rim of the case in the external case head measurement.
This would give you an optimistically large amount of force that the action could handle. The pressure is only pushing on the internal case head area, which is much smaller than the exterior case head area if you're including the rim.

Weld a bit of 6 mm steel to the face of the block and extend the firing pin!

Yes also using outside 308 case head measurment giving larger readings of force.

So I have tracked down a 9mm barrel off cut just under 4" long. So who here can thread it and drill out and thread the chamber insert for me?

@veitnamcam @vietnamcam

Hope one of those is right

4"? Must be pretty cold steel?

Think its just stainless the chamber insert.

Originally Posted by Toby

Think its just stainless the chamber insert.

Haha whoooooosh!

I have no idea what you're talking about. But you would have guessed that from the first post

Hahaha I think I just got what you were talking about. Only took me a week

Anyway How much jump can you have between the chamber and rifling? I have the barrel its been thread before so Im thinking just threading the chamber insert and screwing it in like that. Would that work?
@veitnamcam @tui_man2

Send it down I will see what i can sort out.


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Cheers VC, Hope this works well. Need that shell holder for a 9mm now some powder/ projectiles and primers. Gonna load up subs and test to see if it shoots straight out the barrel. if so then a suppressor of some sort is on the cards.



Note, it's not paint coming off it's just mud.

That is a massive bolt on that bipod mate. Gun looks pretty sweet


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Yeah, I'm working on that. Just put it in for now cause the factory one is not long enough by about 1mm. If I used a proper stud it'll be fine but I only have one stud that was laying around not being used

You enthused me, and I built up one of these - will try and drop some goats with mine this weekend.
Also had a lot of fun with mine and making up wax slugs with cheapo skeet rounds !