Forgot about the primer question.

I haven't used benchrest primers, but have made some very accurate ammo with plain old CCI primers, I think you would have to get way down the super accuracy trail before there would be any chance to realize any benefit from the yucky-muck primers. Some primers are made of tougher metal though, in other words you can get away with running hotter loads without piercing, or cratering them. I don't know which primers are best, but I would take CCI first and Winchester last.

Hopefully someone with more experience will chime in...