9x19 reloads optimized for blowback rifle/carbine

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adamg

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I'm wondering about making food for a 9x19 non-restricted blowback pistol caliber carbine, and optimizing the ammo for the gun.

It seems that regular pistol loads are optimized for 4-5.5" barrels with locked breach. The carbines I'm interested in Canada would be 18.6" barrel and blowback.

Has anyone played around with using slower burning powder, or powder that is generally considered rifle powder, to get more performance out of this kind of gun?

Performance being measured by various methods for the application at hand. Today let's consider 300m ballistics (minimizing drop and wind drift). Would a person want to go 115, 124, or 148gr bullet? It seems like you would want to run a 148 at just below speed of sound to avoid transonic.
 
just having some fun said:
I think the 9mm is too powerful to do a blowback design

I think the 9mm macronof (spelling ? ) 9x17 was one of the last design and was not too popular (at least in north america)

to do a blowback design you have to keep the projectile light / chamber pressure low

a longer barrel would increase hot gases being blown back in your face ( case would extract with a high pressure still in the barrel)

For instance the 3006 m1 Garand has the gas port less than 1 inch from the end of the barrel
Click to expand...

The JRC is blowback, the Aero is blowback, the Beretta MX4 is blowback, and a lot of the 9mm uppers for AR-15's are blowback. The JRC right in the manual says its rated for 9x19mm +P+ loads. 9x19 is fine in blowback as long as you account for the forces involved which means a heavy buffer and recoil spring.
 
I was wondering the same thing but for 45acp. A larger amount of slower powder, so that pressure doesn't build up too much too fast, but since the barrel is 3-4 times the length of a typical pistol, it has enough time to burn all and keep propelling the projectile for the whole time it's in the barrel. I was thinking maybe trying H110 or IMR4227 for that. Both powders are used in handguns and rifle, so it would seem about right.

It would be easier with 45acp than with 9mm due to larger case volume. Easiest one would be 10mm.
 
adamg said:
I'm wondering about making food for a 9x19 non-restricted blowback pistol caliber carbine, and optimizing the ammo for the gun.

It seems that regular pistol loads are optimized for 4-5.5" barrels with locked breach. The carbines I'm interested in Canada would be 18.6" barrel and blowback.

Has anyone played around with using slower burning powder, or powder that is generally considered rifle powder, to get more performance out of this kind of gun?

Performance being measured by various methods for the application at hand. Today let's consider 300m ballistics (minimizing drop and wind drift). Would a person want to go 115, 124, or 148gr bullet? It seems like you would want to run a 148 at just below speed of sound to avoid transonic.
Click to expand...

I have not shot to 300m but out to 200yrds with my IWI X95 in 9mm which is also blow back I've tried 115gr, 124gr, and 147gr the accuracy was best with 124gr HP Hornady HAP and Campro HP. For powder I tried Silhouette, CFEPistol, HP-38, and CFEBlk the best results were with Silhouette followed by CFEPistol. I was pushing them to +P+ loads but stopped as the brass had the bolt face imprinted into the base.

A 9mm carbine is a lot of fun I never thought I'd buy one then I tried a few friends and had to have one.
 
I've played a bit with my TNW. 4227 is a bit to slow as there is zero lockup on the bolt a lot of gas comes back. Long shot seem to work OK. My best results were with a bit faster powders. 800, cfe, hs6 type of range.
 
I have a 9mm blowback carbine. (And a 40, too). You can load slower pistol powders, but best velocity would be the medium speed powders, like 3N38, N350 and Universal and Power Pistol.

For longer range the 147 is the bullet. It will be supersonic.
 
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