Originally Posted By: justin
I wonder how much more pressure is developed with the primer in the powder? I have not heard of this causing a barrel to blow,so I'm curious.


I wonder, too. But if you look hard enough in the published data, you can find instances of a simple primer change resulting in a peak pressure increase of 3,000 psi. Add in the unknown effect of primer ignites powder ignites second primer and I wouldn't be surprised if it were greater than that.