engineer40
Well-Known Member
Lube on the case when firing will significantly increase bolt thrust and can keep the case from proper obturation to the chamber. This can give you a 'false' high pressure. It isn't really false, it's just the case isn't sealing to the chamber and is transferring all the pressure to the bolt face, but once the cases are cleaned of lubrication the load should be ok.
Not many people talk about this. I even remember an article I read by David Tubbs that said he doesn't tumble his brass every firing and when he does, he doesn't do it for long... He went on to say if your brass is too clean it becomes too slippery and it puts too much pressure on the bolt face.