I have a question for you experienced reloaders. Is it necessary to clean your brass every time before reloading match grade 223 or 308 bullets? Example, I purchased Black Hills match grade ammunition in 223 fired once through my varmint AR15 rifle. Is it necessary to clean the brass if it already appears clean? Will that hurt accuracy if I just clean primer pockets? Also how many rounds will I be able to get from one pound of reloading powder for match grade 223 ammo? Thank you guys for your helpful advice.