ORIGINAL: maineac
Sorry to have left out the powder. I am using Goex Clear shot FFg. I was swabing every third or fourth shot. I would pull the breech plug and swab from the breech out the end, using only patches. I was shooting 295 grain copper plated powerbelts with 90 grains of powder. also any bore brush, I have 50 cal but it is plastic, would you recomend a copper brush?
Although I am not a fan of Clear Shot FFg.. how old is this powder? I was under the impression they stopped making this stuff a long time ago. Also your pulling the breech plug and swabbing from the breech to the muzzle is all noble, but hardly necessary unless that is the SOP for that style of rifle. I do not have one, so I could be uninformed. Sure would not be the first time.
Seeing you were shooting 90 grains of Clear shot I would not think you would have copper fowling that was causing the poor accuracy. I shot the stuff once. I friend owned it. I think I had to add about 30 grains or more to get my load power back. Now Clean Shot is a whole different story. I like that stuff.
If it were me with this problem, I would get some Triple Se7en FFg powder and try 90 grains of that. I think that might cure your problem. As for a copper bore brush, they will remove crud a little better then a plastic one I might think. My worry would be a plastic brush would desolve in some of the solvents I use...