Quote Originally Posted by beast556 View Post
I try to run 5rds of 5.56mm to blow all the crap out.
Bad plan, assuming you didnt scrub the barrel 100% clean.

All you do is squish all that lead and carbon build-up from the 22 ammo into the lands and grooves. When you do scrub it, it is a real bear to get out.

22 LR is filthy. Clean your barrel before you go shooting 223 through it.