Dusty Stevens
Shiner
I clean after every day, assuming I have unlimited sighters the next day for the first relay. If it is only a 2 sighter on the first relay for the next day, I usually do not clean and will clean after the end of the 2-day match. I do not have enough concrete documented data telling me if this is helping me or not.
I found that my 6 dasher barrel took about 8-12 rounds from a clean to really stabilize. My 284 Shehane took about the same amount of rounds.
What I like to do is shoot 8-10 shots the day before to get a zero and my velocities. Then, it is not uncommon for me to go 2-4 sighters and go for record.
+1. That should foul any barrel properly. The 60 round to foul barrels are tomato stakes