10/9 or 10/357

[old Grump]

Just curious, I haven't found anything on it and was wondering if anybody ever heard of necking down a 10MM case to .355 or .357 to make a 10/9 or 10/357. It would be a bottleneck case with a short neck and loaded to 37000/37500 psi pushing a SJSP or SJHP bullet in excess of 1500 fps. Might be a little brutal in a small gun but a 1911 style longslide should soak up the recoil nicely and allow enough control for reasonably fast follow up shots. Wouldn't want it for a CCW but it would be a heck of a battlefield gun or hunting gun for deer/elk size game out to 200 yards.

Chambering for a bottle neck with those high pressures might b a little tricky, You dont want the case to blow out to a straight neck and you don't want it to get wedged in so tight you wouldnt be able to extract it.

Not thinking about doing it this is just a thought exercise. Maybe a revolver might be a better fit if extraction is a problem.

Any brain storming thoughts on a wildcat like this or do you know of anybody who has done this?

[Gunreference1]

Someone else has already played with this idea in an EAA Witness.

http://www.handloadersbench.com/forum19/8208.html

Steve

[old Grump]

Thanks Steve and it looks like he's getting what I expected considering he is using 125 gr bullets. I was pretty sure somebody would have thought of doing this but I couldn't find it.

This site you led me to is now book marked, I have a feeling I'm going to be wasting some time there. Best part he mentioned no extraction problems but I don't know what pressure level he reached. I hope he posts more because I'd like to see his follow up with heavier bullets.

[deth502]

already been done with the 40 s&w in the 357 sig, id imagine lengthening it slightly to use the 10mm length brass wouldnt be too much of a jump.

[old Grump]

Thought about that but its a low pressure round in comparison at 3500 psi and a hair less capacity, It would still probably be quite a bit faster than a standard 40 cal 165 or 180 gr bullet.

[davepool]

Some thing like this maybe?



The 9x25 is a 10mm necked down to 9mm.


I have a 6" barrel in this caliber for my glock 20, pretty snappy little round.

Doubletap offers about 10 varieties of this cartridge, i have some 90 grain FMJ that cronos at over 2000 fps

[Gunreference1]

Davepool, I believe you have hit the nail on the head. I had forgotten about the 9x25 Dillon cartridge. It looks like Doubletap has factory loads for it too.

Steve

[Schuetzenman]

Some thing like this maybe?



The 9x25 is a 10mm necked down to 9mm.


I have a 6" barrel in this caliber for my glock 20, pretty snappy little round.

Doubletap offers about 10 varieties of this cartridge, i have some 90 grain FMJ that cronos at over 2000 fps

That's a zippy little round to be sure. Out speeds 7.62x25 Tok. That would make a pretty good subgun round I think. Imagine a 10 mm HK rebarreled to the 9 mm with that chamber. Turns it almost into a full blown midrange weapon.

[old Grump]

Some thing like this maybe?

The 9x25 is a 10mm necked down to 9mm.

I have a 6" barrel in this caliber for my glock 20, pretty snappy little round.

Doubletap offers about 10 varieties of this cartridge, i have some 90 grain FMJ that cronos at over 2000 fps

Now aint that the cats meow. I swear if it could be done somebody has already done it. Bet it would make a decent hunting round for deer size critters with a 160 gr SP. Even better for the long range silhouette game.

[Partisan1983]

That's a zippy little round to be sure. Out speeds 7.62x25 Tok. That would make a pretty good subgun round I think. Imagine a 10 mm HK rebarreled to the 9 mm with that chamber. Turns it almost into a full blown midrange weapon.

I was dreaming the exact same thing !!!!