[horseman308]

Definitely try the switch from FFg to FFFg. Make sure to reduce your charge by about 15-20% to get the same pressure and velocity, since FFFg burns hotter than FFg (25 grains of FFFg would be approximately the same as 30 grains of FFg). Another thing, you've mentioned twice that your patch is .001. Are you certain of this? That's 1/1000th of an inch and extremely thin. Most t-shirts are at least .10 (1/100th). If it's tight in the bore, then that's fine, but I was just curious.

Another question is what type of lube are you using? I've found that different rifles like different lubes, especially after several shots. If you reduce your powder charge, use FFFg, and use a lube that helps keep fouling soft (Bore Butter, mink oil, crisco, even olive oil, and other animal fats are all good choices), you should see your groups become more consistent. However, some rifles simply don't take fouling very well and have to be swabbed more often. It's inconvenient, but sometimes you just have to do it.