I've heard and read many a comment on this subject. I am now comfortable in believing that (unlike with centre fire rifles) you should only clean your PCP barrel when accuracy becomes impaired.
After about 2000 JSB shots , this has become the situation with my BAM 50. I then tried the old method of shooting some Marksmen pellets through it and this seems to have done the trick.
However , I still don't believe this is the ultimate solution. There must still be quite a lot of lead left in the barrel.
I now want to push my cleaning rod with the copper brush at the end through it. I know some people say this could damage the inside of the barrel for a PCP barrel is not at hard & durable as a centre fire barrel.
I think this is nonsense and you can't do any damage to your barrel by cleaning it with a capper brush.
What say you?