Problem with S&B primers

[Skgreen]

The ones with the blue are pistol primers.

Just dug some S + B small rifle out of my stash,,, Green priming compound as well.
FWIW, I tried them (once) in my 357,,, Won't be doing that again,,,,Had to smack some 2-3 times, but they all eventually fired

 

[Axis II]

I agree the bullet should have no effect on the primer ignition. I'm also at a loss as to why the new primers work fine in the 9mm cases but are a major problem in the 380 cases.

You say they are seated correctly but you don't say how you know that? You also make no mention of a second strike with the ones that don't fire. That is usually a good indication of primers that are not seated properly. Much of the time a second strike will fire them. Did you try a second strike in any of the failed ammo?

Sorry I can't help more but I'm sure you know how difficult it is to troubleshoot a problem over the NET.

My j frame won’t set s&b off but my m&p does without issues.