I would like to say hello to all on the forum I have read quiet a bit about unburned powder from different issues reloading , but I haven't got to reloading yet just been shooting Federal 450 Bushmaster 300gr power shok. After shooting just a few rounds there is a lot of what looks like unburned powder residue inside barrel. Has anyone else had this issue or do I have a problem?
I am shooting my on build it's 20 inch factory bushmaster barrel, AR style rifle.