Are Seller and Beloit primers soft?
I purchased a couple hundred at Cabela's to try since they were about half the price of CCI or Winchester primers they had on the shelf. I loaded up some 9mm and had a chance to shoot some today. There is a slight bulge around where the firing pin hit the primer on the spent case. The loads are not hot, about mid range in my reloading manual. I only had a few Federal aluminum case factory loads to compare them to, and the primers on the Federal cases looked about the same. To be honest, I don't know if I have ever picked up the brass from this pistol (Taurus 709 slim) before, so I have no idea if this is common on all brass from this gun.