Originally Posted by
isartw
Well, that is the problem. You are absolutelly right about powder/load. I would say primer make difference. But as for swabbing, cleaning, not cleaning options, I have found that running one/two dry patches makes significant difference. Dirty barrel gives bad groups even with Powerbelt, which are advertised as ditry barrel friendly. Also, cleaning with solvent takes time from the one hand. From the other hand, you have to dry barrel before shooting, otherwise powder gets slightly wet and that also affect results.
As for out of range cleaning, I like Hoppes as general purpose solvent, especially when clean my SKS after corrosive rounds shooting, but I've found that T/C #13 works better as bore cleaner. I just spray it inside bore and wait 15-20 min, then run brush one or two times, then two dry patches to make sure second goes clean and then oiled patch with remington oil.