I've been having problems with high primers on my 357 magnum reloads. Normally I use Winchester brass but it has been getting hard to find so these are Remington cases. One of the few times I've used Remington brass
Cleaned all the primer pockets. Got out my RCBS trim mate. Used the primer pocket uniformer on all of them. Got out a fair amount of metal from the primer pockets.
After this, at least initially, all the primers seated properly. After a reloading or two, however, the problem was back big as ever. It appears as if the brass is flowing into the primer pocket area.
I've never seen this before! Any suggestions? I'm thinking of throwing these cases away and starting over with new brass