9x25 dillon.

[TAB]

I'd rather have a strait stock then a glock as a handle...  they just never feel right in my hand.

[Big Frank]

I'd rather have a strait stock then a glock as a handle...  they just never feel right in my hand.

I hear ya. Traditional stocks feel great between your hands. The good thing about the pistol grip is being able to shoot one-handed if you need to or want too. I can handle anything up to 12 gauge one handed if it has a pistol-grip stock.

[Ocin]

Correct.  A 9x25 is a 10mm case necked down to take a 9mm bullet.

If I could find a good surplus magazine for it, it would make one hell of a sub-gun round in an AR platform.

USSA-1

Olympic Arms is making an AR-15 based carbine chambered in 10 mm Auto:

http://www.olyarms.com/index.php?page=shop.product_details&flypage=shop.flypage&product_id=54&category_id=7&manufacturer_id=0&option=com_virtuemart&Itemid=37

What would it take for such a carbine to be converted to 9*25 Dillon?

Further more: As I understand it longer barrels work better with smaller calibers, i.e. .45 ACP with a 16" barrel is counterproductive on the muzzle velocity. Mind you, this is just hear say, just yell at me when I'm wrong. What I would like to know is what muzzle velocity and kinetic energy might you expect from a 16" carbine chambered in 9*25 Dollon, as compared to for example .45 ACP or 9mm Luger?

[USSA-1]

How much difference in the MP-5 9mm and 10mm?  Could you "role your own"?  Curt Higgins at S&H Arms (just a few miles from USSA) might be able to build one from the 9MM...

No, the 40 S&W/10mm MP's is built on a different frame.  No way to convert it over without major structural changes.

What would it take for such a carbine to be converted to 9*25 Dillon?

This would be the easiest conversion.  Just get the 10mm upper and purchase a 9mm barrel.  Ream the 9mm barrel and install it on the 10mm upper and your done.  The issue is the magazines.  Finding magazines that will run a 10mm cartridge and still fit into an AR magazine well is the real challange.

Further more: As I understand it longer barrels work better with smaller calibers, i.e. .45 ACP with a 16" barrel is counterproductive on the muzzle velocity. Mind you, this is just hear say, just yell at me when I'm wrong. What I would like to know is what muzzle velocity and kinetic energy might you expect from a 16" carbine chambered in 9*25 Dollon, as compared to for example .45 ACP or 9mm Luger?

The reason most pistol caliber rounds show only moderate or even slower velocities from carbine barrels has more to do with the type of powder used in their manufacture.  Most pistol powders have a relatively fast burn rate.  As such, gas pressure behind the bullet is usually starting to diminish as the bullet is exiting a 16" barrel.  The drag of the bullet in the barrel starts to slow the bullet down before it exits the barrel.  This is why most sub-gun barrels are in the 6"-7" range.  Anything more is a waste as is does nothing for velocity and it creates a longer firearm which defeats the purpose of a subgun.

The 9x25 has a lot of case volume for use with slower burning powders.  It would not surprise me to see velocities over 2,000 fps with the right loads from a 16" barrel.

USSA-1

[Big Frank]

Several pistol calibers gain about 30% more energy in carbine barrels with factory ammo because of the higher velocities. 357 Mag is nearly double IIRC. The gas pressure pushes on the bullet longer and accelerates it more. In my own experience 185 grain .45 ACP +P performance is amazing in a 16" barrel compared to a 3-5" barrel.

Here are the velocity INCREASES, not decreases, Mech-Tech lists. All bullet weights in all the calibers they tried were FASTER.

Bullet Weight  Barrel Length  Min. Velocity  Resulting Velocity 

230 grain 
5 inch 
850 fps 
1065 fps 

200 grain 
5 inch 
950 fps 
1212 fps 

185 grain 
5 inch 
1000 fps 
1260 fps 

124 grain 
4 1/4 inch 
1150 fps 
1465 fps 

115 grain 
4 1/4 inch 
1175 fps 
1513 fps 

[Sponsor]

[Hazcat]

Well, I have an 18 inch Puma in 45 Colt that adds 300 fps over same round from my Redhawk 5.5 inch.

My sons 20 inch Puma in 44 mag also adds 300 fps over his 6.5 S&W.

[Big Frank]

Well, I have an 18 inch Puma in 45 Colt that adds 300 fps over same round from my Redhawk 5.5 inch.

My sons 20 inch Puma in 44 mag also adds 300 fps over his 6.5 S&W.

Have you seen any caliber come out of a carbine slower than a pistol?

[Hazcat]

Have you seen any caliber come out of a carbine slower than a pistol?

Nope, but maybe there is an optimum speed at some other length like 9 or 12 or.....?

[Big Frank]

Generally speaking 10" Contender barrels shoot faster than shorter pistol barrels, 14" barrels are even faster, 16-1/4" barrels are faster still. There may be some exceptions to that rule, but an experiment I read about where several barrels were connected end to end, it took not just inches but yards of barrel length to slow a bullet down significantly.

[walangkatapat]

I believe TGO used it for a while.

Richard

That's correct some years ago the 9x25 was the hot round in IPSC, it didn't last long. I remember ROing a couple of shooters at our local match, LOUD! I mean x2 hearing protection loud.