[Pioneer2]

First thing as stated hand check each brass case mouths for out of round.The tip of a loaded cartridge inserted and rotated by hand with fix the out of round ones enough to seat bullets.Second chamfer the inside + outside of the necks to prolong brass life and minimize stretching/wear.Some do ,I never have [exception may be auto-loaders] full length resize them.In a bolt this is not needed unless hunting something that may eat or kill you.More for peace of mind.When loaded feed them into the gun to make damned sure they cycle.I buy new brass when I run out of range brass or for obscure calibers.Should get about 10 reloads per case and trim as needed depending on caliber.....Harold