Have 22-250 and I have put about 80 rounds through it. 40rds we're rem 45grhp other 40 was win 55grhp. If I was to buy virgin win brass and weigh each case for consistency, can I mix the once fired win brass with them as long as I weigh them and FL resize? same question for rem brass. I have a bunch if federal fusion brass for my .308 can one get new virgin bulk brass from federal? I know brass thickness can vary from lot to lot. So trying to decide cost wise if I should just buy couple hundred rounds of brass or buy a particular brand of factory and go from there.?