Yep. EVERY time it is fired! (The only time I did't clean my rifle thoroughly was after Pre-Qualification shooting. Didn't want to mess with it and screw up my "dope" for "Qual Day". Probably superstition more than anything else. I WAS a rather cracker jack shooter in my time. Still fair, but the eyes have grown less sharp over the years.) (Sigh! It's a ***** getting old! On the other hand, one MUST consider the alternative........) (LOL!)
GG
P.S. For rifles it is always recommended to use a chamber brush also.