ive bought once fired 5.56 mil brass (to turn into 300 fireball brass) and it was all good. Almost all needed trimmed to bring it to 223 spec. I think the biggest concern with mil brass is being fired from either fluted chambers (European guns) or machine guns (over sized chambers). with pistol brass i doubt you will have problems. mill brass is usually a little thicker and in my experience better than commercial brand once fired. with the rifle brass a little prep work can turn it into great brass.