Curly-Nohair said:
Thousands of pierced primers are never detected. Here is one
Here is another that is more easily detected.
Each one of these is a source of extremely hot gasses around 10K psi. A very small cutting torch in effect, no wonder steel firing pins get eroded.
Here is one
Here is another that is more easily detected.
Each one of these is a source of extremely hot gasses around 10K psi. A very small cutting torch in effect, no wonder steel firing pins get eroded.[/quote]
Merry Christmas Curly....hope this note finds you well....
I know this is an old post, however I have had to deal with FTF lower barrel( 725 12 ga) and an extremely dirty trigger mechanism that just started to occur when I loaded up some AA grey/NS sport primers/1 oz CB1100 wads 18 grains of Clay Dot. The pin has been slightly fractured for almost a year and the upper pin shows very little wear. The AA's are 4-6 years old once shot...I mention this because I never had this happen with the grey ones that I have used which were gathered up last spring using the same recipe and never a problem with red AA, nitros, sts and gun club all using the same components.
This is a picture of the trigger before a sonic cleaning:
cpg1410/displayimage.php?album=random&cat=67361&pos=-15720.
My guess is the problem was way too much "gunzilla" cleaning the breech etc and carbon entering the gun because of pierced primers grabbing on to the gunzilla that had entered the gun. All my empties bear the same mark as the fractured pins.
I had the gun sonically cleaned and had a J&P kit installed to include firing pins, hammer springs and top level spring.
https://www.jnpgunsprings.com/product_i ... cts_id=226
I shot a few boxes of the suspect grey ones, some red AA's, gun clubs, nitros, and sts. No fail to fire...you can tell the lock time is faster and the trigger felt a bit crisper. I checked the lower pin and it already has a very small fracture. This pin is .005 longer and and made from S-7 tool steel and heat treated to provide the correct hardness to resist chipping by hard primers. I was a bit surprised.
Am I to assume the once the pin is even slightly chipped or fractured that it is puncturing the NS primers almost ever time I pull the trigger? I thought it was random occurrence chipped pin and all. J&S tells me that nothing is impervious to chipping when it comes to NS and even more so with Cheddite. I love their new springs...however I do own a case of NS primers and would like to continue to use them.
I know a lot of folks at both clubs I shoot at that use them routinely....even a guy that shoot a lot of them through his CSMC Winchester 21's.
Thanks in advance
cpg1410/displayimage.php?album=random&cat=67361&pos=-15720