Is this pressure sign ?

powdergun

powdergun

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I loaded some rounds for my 40sw. They functioned very well and were accurate but I am wondering if they are showing pressure signs. The load is 5.2 and 5.4 gr or unique behind 180 gr canpro bullets. The brass flew about double the distance as some wolf loads..




BTW the gun was a Glock 22 and the load data came from a Lyman manual and was well within min max. Brass looked good too.
 
primer edges show the factory roll, no cratering. You are fine.

When the primer FLATTENS and looks like it is tight to the side of the primer hole, then yes, you have pressure signs. As well as cratering, pinhole in the primers etc.
 
I agree it's not high pressure, but something weird is going on. Is the metal of the primer kind of bunched up above the slot?
It almost looks like the firing pin is striking low and sliding up to the middle of the primer??
Is the firing pin hole oversized? Firing pin look normal?
 
Tex Critter said:
Every Glock I've seen leaves that rectangular mark.
Click to expand...

Yup. That's what the tip of the striker looks like.

striker-right1.jpg
 
That is good to know as I really liked that load. I guess I will spend tomorrow reloading as we got a foot of snow here tonight cause getting to the range won't be fun.
 
It doesn't look like the primer is flowing into the firing pin recess, but is it possible that the firing pin is dragging across the primer as the cartridge is being ejected? If that's true, a stronger firing pin spring would likely correct that.
 
What vintage is the gun? If it's a really early production gun from when the 40 S&W came out it "might" have a "primer swipe" issue. I recall that when the first 40 cal pistols first came out that the timing could be "off".

Pressure vs slide weight vs the ectractor kicking the shell out of the gun before the primer had a chance to retract. It was sorted out fairly quickly in the industry because nobody wanted to have the reputation of having to replace broken or bent firing pins in police contract guns.

The manufacturers couldn't just use a 9 mm weight slide with the 40 cal...It had to be reengineered with heavier alloys, or a different firing pin spring, or something.

I'm going off of memory of a magazine article I read many years ago, so it's very possible I'm very wrong.
 
Lionel said:
What vintage is the gun? If it's a really early production gun from when the 40 S&W came out it "might" have a "primer swipe" issue. I recall that when the first 40 cal pistols first came out that the timing could be "off".

Pressure vs slide weight vs the ectractor kicking the shell out of the gun before the primer had a chance to retract. It was sorted out fairly quickly in the industry because nobody wanted to have the reputation of having to replace broken or bent firing pins in police contract guns.




The manufacturers couldn't just use a 9 mm weight slide with the 40 cal...It had to be reengineered with heavier alloys, or a different firing pin spring, or something.

I'm going off of memory of a magazine article I read many years ago, so it's very possible I'm very wrong.
Click to expand...

The gun is a Gen3. I suppose it would not be of the vintage you refer to ?
 
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