Re: Resizing / Decapping. Questions
The dents are cause by the excess lube getting captured between the case shoulder and the shoulder step in the die. The lube is incompressible so it indents the soft brass case.
The lube I use is the RCBS lube on their pad. I load the pad so that it is barely damp with lube and give the case a gentle single roll across the pad. And even sometimes that is too much lube. I don't like spray lube because it is always too much. Some here use special lubes that they rub onto the case with their fingers. You need some lube or the case will stick in the die and be very tough indeed to get out but too much creates the dents you are seeing. You just have to find the right amount through trial and error. But too little is a BIG problem you don't want.
The dents will be pushed out during the firing (50,000+PSI inside the case during firing!).