I build custom match and hunting rifles using all of the major manufacturer blanks. I clean them thoroughly before the first shot is fired and clean them again when they need it. That might be 50 rounds the first time and 250 rounds the next.
What he said.
A thorough clean and lapping with diatomaceous earth before the first shooting. Then, I clean the bore when the rifle tells me to clean the bore (accuracy degradation) or I can?t remember the last time I cleaned the bore.
Granted, the action/receiver is cleaned more often. Having moving parts and all.
