One thing I have found is that you can’t ask someone “what do you shoot for good accuracy” and expect that your rifle will duplicate it. Lots of experimentation to find accuracy: I is usually use 85, 90, 95, 100, 105, 110 on all new bullets to see what is most accurate. Never gone above 110. Neck can’t take it. But then my elk load is 95 gr
As to your encore, I had a TC Omega ( same company/similar barrel) that shot conicals at an 8 “ group at 25 yards with some bullets going thru the targets sideways. Sent that gun to T/C and they produced a group of 1& 1/2” at 50 yards with 80 of real black and a maxi ball. I had never tried real black but had used 5 or 6 different conicals with lousy results. They would t replace the barrel.
How May bullets and powders and different amounts of powder have you tried? Could be a different bullet or a different powder would give you the results you are looking for. Either way, you are getting a lot better accuracy with conicals that my T/C gun got.