So I have another snider that I am working on that has a questionable bore. I have tried 75gr Ffg with questionable accuracy. Then dropped down to 70,65grs. I then grabbed a load from my carbine snider that shoots lights out and tried it. Well it was right on target. So back to the drawing board I go. The carbine load is a different , lighter bullet so I load up 8 at 75,70,65gr. 50-50range scrap/pb composition. I noticed after 3 shots with the 65gr i started to get fliers. So I cleaned after every shot and I had about 5 clean bore shots in 3"s at 50m. With the 70gr and 75gr clean bore groups they got worse to the point they where not on paper 75gr being the worse. My load is Ffg, Cow with Fffg to take up space, 1/8" grease cookie sandwiched in parchment paper below a cereal box wad. I'm about 5thou over sized with my mold. Iam wondering if the COW is creating too much fouling in the bore. The rifling is not totally shot but does seem shallow compared to my other snider. Should I try a 24gauge fibrewad? Would his keep things cleaner? Since this gun is sporterized I have installed a pin in front of the barrel band to keep it in place as it would slide off with recoil and I have bedded the tang area to stabilize the action. Any thoughts would be appreciated.