Originally Posted by Country101
Steve, I think too, that if you are referring to the media taking up extra space and having a normal charge, this could be bad. I dont reload, but from what I gather from these fellas posts occasionally is that the pressure will be a lot higher with the lower amount of space in the cartridge. That would make it dangerous.
Correct me if I am wrong here, fellas.
NO, you are not wrong. But is the reduced case capacity from what I described enough to cause a catastrophic case failure?
OK here's the deal.
A fellow handloader had a catastrophic failure in his Mini-14 a few months ago and he never found the cause. The case looked like this.
A few days ago he was loading for his Mini-14 with the same load and a new powder measure. All powder drops were consistent and they all filled the case to the neck/shoulder junction. All but one, this one case had powder up to the top of the neck. He dumped the powder and charged it a few times and each time the powder was up to the top of the neck. Upon further inspection he found media stuck to the sides of the case. Not packed on the bottom, stuck to the sides.
He concluded that the previous KB was the result of media stuck to the sides of the case.
I don't buy it. In my experiments a full case of H-4895 weighs 27.2gr. Hodgdon lists 26gr as Max with a 69gr bullet. QL calculates 27.2gr with his 65gr Sierra bullet at just under 64K psi. This load will not produce enough pressure to destroy a case like the the picture above.
If a full case full of H-4895 can't produce enough pressure to KB a case, how can a load that is part powder and part media produce this kind of pressure?