Yes sorry I should have said, shotgun.
I was specifically thinking caplock, however the principles are the same and interesting point re the vents/nipples, makes sense.
Older caplocks sometimes have "vents" on the side, I gather the theory of these being excess pressure relief.This would have an even more pronounced effect.
Forcing cones, crimp pressure, vents, nipples, all in all a few variables which could go either way.
Drew I will read through the link you have kindly provided.
I really wish I could remember where I read about the slotted chambers, perhaps it was GT Garwood.
Anyhow supposedly they were cut right through the length of the chamber and fired with normal loads to no ill effect.
If I find it Ill post.
Cheers,
GDU.
