I go with Neil as for barrel conditioning 25 shots per per pellet type using the last five on a clean target and taking my results from this,

I am not a big scour the crap! out of any gun barrel Fan,

So I run a soft brass rod with an oiled mop a few times through the barrel of my springers after each use and then put a felt into the breech to stop any oil running back into the compression chamber to prevent dieseling,
then fire three pellets into the bank on the range the felt dries out the barrel and next two to make sure it's oilfree,

shoots consistently everytime,

PCP's

Refill gun with air, shoot through three dry felts (at an old carpet) fire one more with two drops gun oil on it, and insert dry felt,

At the range fire dry felt plus three pellets, away ya go,

Have learned a lot of this on here,

Great Thread Neil, saved a lot of lead and annoyance,

Hold The Zero Everyone.