The T/C's I had all did better than 4" at 25 yards but I never got consistent 3" groups at 100 yds either until I went to 66 twist. Swampman you should read Roundball's past posts and see if you can't get better groups - I'll bet you can do better than that off the bench. I get fairly consistent 2-3" groups at 100 yds with the 66 twist when I have a good day. My dissatisfaction with my current T/C stems from the loading difficulties I have after only 3, sometimes 2 only shots. If I dont swab the bore, I ain't gonna be able to load it.
I've already read all of Roundball's posts and it's uncanny but I have always done just about exactly the same things as he does. I clean the gun with hot, soapy water to where it'd be welcome in an operating room. I never used any oil-based anything in it - just Nat Lube 1000. Always used pre-cut pillow ticking patched lubed with Nat Lube 1000. I've varied patch thickness but lost accuracy as I gained ease of loading and I won't make that trade. Tried different ball diameters to the same effect. Tried different powder charges and went down as far as 75 grains of 2 F but wasn't much better. I respect the deer too much to go out there with a light charge and a PRB. Tried 3f powder - no difference. The only thing I don't do is the wads under the patched ball - never tried that but I don't see how it can solve my problem.
Since I've had this problem in two T/C's that I've purchased, you can see why I feel as I do about T/C. I know Roundball feels differently but he is getting the results he expects and I rarely have. I'll hunt one more year with this T/C - I've lapped the bore with steel wool and I'm going to open the touch hole a little and I may try wads. If this lancaster I'm building gives me the results I'm looking for, I will sell yet another T/C and never look back.
Finnwolf