[kraigwy]

I'm not going to get on this "beating a dead horse" band wagon but I want to mention blown primers a bit.

Blown primers may or may not have anything to do with pressure. If you suspect excessive pressure look at the stamping on the rear of the case. It the writing or stampings are deform, it's probably high pressure. If the lettering is sharp and clear, its not high pressure regardless if primers are blown or not.

Take an primed, empty 38 case an stick it in your revolver. Shoot it, you'll see the primer will back out often jamming the cylinder.

Low pressure will can also cause primers to back out. Research "high pressure signs" and study them.