Norinco 9mm - Page 4

alvin · 01-16-2010, 11:21 AM

It's good to know, because the booklet did not say the weapon being a pistol or MP38/40 sub. 7,63 Mauser twist is 1/200 RH.

unspellable · 01-18-2010, 02:02 PM

There are two different ways to break a Luger with too hot a load, too much impulse or too much pressure. Pressure wise the action is quite strong so the usual way of damaging it is with too much impulse. Sieger's breech block slapping is an indication of too much impulse.

I have seen a breech block with the lower front edge blown off, a case of too much pressure. I have no idea what the load was, for all I know it was a compressed load of Bullseye. (I did see a S&W Model 10 that was blown open with a known case full of Bullseye.)

When adjusting a hand load look for the correct bullet weight and velocity combination. If that's right you're unlikely to be too high on pressure unless it's some weird off the wall load.

gordie k · 02-14-2010, 05:13 PM

gentleman; read all the posts with much interstes the prob.with the ammo is presser curve, refer to fokeys book on 34-42 michine guns when tested with us ammo many malfuncons switched to german all prob. went away. about 20-25 years ago in one of the gun books had a artical about the proper presser curve for a luger and what power to use. i work for wiselite arms and we have to match springs to ammo for proper operation
gordie k

Sieger · 02-17-2010, 12:20 AM

Quote:

Originally Posted by gordie k

gentleman; read all the posts with much interstes the prob.with the ammo is presser curve, refer to fokeys book on 34-42 michine guns when tested with us ammo many malfuncons switched to german all prob. went away. about 20-25 years ago in one of the gun books had a artical about the proper presser curve for a luger and what power to use. i work for wiselite arms and we have to match springs to ammo for proper operation
gordie k

Hi:

I have to tell you first, that Unspellable is, indeed, a highly respected Professional Engineer in real life, but, here I have to disagree with him and agree with you, based on my 30 plus years of reloading for the Luger.

I have found that loading with a powder similar to the original DWM powder and at the same velocity, does, indeed increase both accuracy and functionality of a Luger.

Powder should be "medium slow". Try Power Pistol or IMR SR 4756, as these are the closest powders I've found to date.

When you can fire a Luger 1,000 times without a function problem, and with extreme accuracy, you have found the right combination.

Sieger

unspellable · 02-14-2010, 10:54 PM

Pressure curve has absolutely nothing to do with anything as far as the Luger's functioning is concerned. Impulse has EVERY thing to do with it. The Luger has a RECOIL operated action, not a gas operated action where pressure curve might matter.

The cannon velocity is determined by impulse. The cannon momentum determines functioning. The pressure has fallen to essentially zero before the action unlocks. (Unlike some other recoil operated actions where the timing is such that the action unlocks sooner.) The pressure curve enters into this only insofar as you have to have a pressure curve in order to launch the bullet in the first place. A fast powder vs. a slow powder will make absolutely no difference given the same impulse for both loads.

Thread Tools
Show Printable Version Email this Page
Display Modes
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode

01-18-2010, 02:02 PM	#2
unspellable User Join Date: Jun 2002 Location: Iowa Posts: 769 Thanks: 0 Thanked 20 Times in 12 Posts	There are two different ways to break a Luger with too hot a load, too much impulse or too much pressure. Pressure wise the action is quite strong so the usual way of damaging it is with too much impulse. Sieger's breech block slapping is an indication of too much impulse. I have seen a breech block with the lower front edge blown off, a case of too much pressure. I have no idea what the load was, for all I know it was a compressed load of Bullseye. (I did see a S&W Model 10 that was blown open with a known case full of Bullseye.) When adjusting a hand load look for the correct bullet weight and velocity combination. If that's right you're unlikely to be too high on pressure unless it's some weird off the wall load.

02-14-2010, 05:13 PM	#3
gordie k New User Join Date: Feb 2010 Posts: 1 Thanks: 0 Thanked 0 Times in 0 Posts	gentleman; read all the posts with much interstes the prob.with the ammo is presser curve, refer to fokeys book on 34-42 michine guns when tested with us ammo many malfuncons switched to german all prob. went away. about 20-25 years ago in one of the gun books had a artical about the proper presser curve for a luger and what power to use. i work for wiselite arms and we have to match springs to ammo for proper operation gordie k

02-14-2010, 10:54 PM	#5
unspellable User Join Date: Jun 2002 Location: Iowa Posts: 769 Thanks: 0 Thanked 20 Times in 12 Posts	Pressure curve has absolutely nothing to do with anything as far as the Luger's functioning is concerned. Impulse has EVERY thing to do with it. The Luger has a RECOIL operated action, not a gas operated action where pressure curve might matter. The cannon velocity is determined by impulse. The cannon momentum determines functioning. The pressure has fallen to essentially zero before the action unlocks. (Unlike some other recoil operated actions where the timing is such that the action unlocks sooner.) The pressure curve enters into this only insofar as you have to have a pressure curve in order to launch the bullet in the first place. A fast powder vs. a slow powder will make absolutely no difference given the same impulse for both loads.