.22 Auto Rimfire

[45_auto]

Sounds like a Berdan primed case vs Boxer primed to me.

 

[klyph]

Actually I thought of it more like a boxer primer, except the primer body is also the case. This is taking the boxer primer idea of integrating the anvil and primer one step further.
The 22 rimfires of today are based on percussion cap primers, so why not take a centerfire primer and make a small round out of it? Lengthen the primer body, incorporate an extractor groove, a few grains of powder and a small bullet, you have a plinker for the 21st century.

 

[9mmepiphany]

Then we're almost back to the question I posed in post #3

What are you going to crush the primer against?...that is why CF cases have primer pockets and why RF cases have their priming compound in the rim

 

[mf-dif]

Hi cap rimfire .22? Its existed since the Grendal in 1990. No one cares for it or someone would have adopted the mag design.

 

[klyph]

What are you going to crush the primer against?...that is why CF cases have primer pockets and why RF cases have their priming compound in the rim

The priming compound is crushed between the anvil and the base of the cartridge. I'm gonna draw a picture, hold on.

 

[klyph]

 

[45_auto]

I don't see what your anvil is doing for you. Is this still supposed to be a rimfire? In that case you don't need your anvil, all it's doing is transferring forces to the fwd (bullet) side of the rim. So that side of the rim has to be stiff enough to take the load from the firing pin. No need for the anvil.

If it's supposed to be a centerfire, your anvil is turned the wrong way, and I don't see how you believe that you could make a case with all those operations cheaper than a Berdan primed case (pic below).

 

[JT-AR-MG42]

Dang, you've just re-invented the Benet - pronounced 'benay', not berdan or boxer - inside primed case.

Good news, bad news.
Good news, patents on the Benet priming system have surely run out. So maybe you can grab it up.
Bad news, those patents were not renewed over 140 years ago for a reason. Enter Messrs. Berdan and Boxer.

As I mentioned before, you still have not addressed the unsupported extraction groove in your drawings.
Cartridges develop pressure - the .22LR is rated at 24,000 psi - in order to push the bullet into and through the rifling with enough force to give velocity to the bullet.

This pressure would blow out the thin sidewalls in that extraction groove every time, and probably shear that rim completely off.

My take, JT

 

[jim243]

I am not an engineer by any means. While I like the idea of a double stack mag for my 22 LRs, I will admit that loading double stack 22's would make for a feeding problem. Ruger has overcome that problem with their rotary feed magazine. It works extreemly well for 22 LR as well as center fire cartrages. I just purchased my 2nd BX-25 magazine and am quite happy with them.

Rather than re-inventing the wheel why not make a better tire. I would like to see a 100 round mag that fits under the weapon like they have for center fire weapons (It may already exist). http://www.midwayusa.com/product/79...ger-22-long-rifle-50-round-drum-polymer-black

Short of that one can buy a 100 round CALICO M100 CARBINE 22LR WITH FIXED STOCK.



Jim

 

[pockets]

They already have one available. It is called .25 ACP and it is not all that inexpensive.
It would be easy to make a higher cap MAG for these but nobody wants one I would guess.

Some of us want .25acp hi-caps.........they are fun!


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