Quote:
Originally Posted by Heymatt
Just took a look at a couple of fired brass from the SW40 and the 357 SIG barrels. Firing pin marks are different even though its the same for both barrels. The 40 round looks marked all the way around, unlike the SIG round.
Interesting.
|
Hey, Matt!
When I see a firing pin drag on a primer (as in your first picture), I must wonder if the higher recoil velocity of the cartridge is a sign that the empty shell is bumping against the firing pin during extraction/ejection.
Can the higher slide velocity generated by the higher pressure cartridge (357Sig vs. 40s&w) exceed the firing pin spring's ability to retract the pin.
I think it is a mistake to go to the higher pressure and velocity round while staying with the lower pressure round's recoil, main, and sometimes firing pin springs.
In the second pic, I would think the differences in the case markings are the result of differences in the finish of the two chambers.
Unless I'm missing something...
And many have said that I definitely am!
John