bore butter in your inline is a no no.
As for it shooting all over the place after swabbing. I agree. My winchesters want a dirty bore. 3 shots max before i will swab.
It can also depend on the powder u are using. T7 likes to shoot all over the place for me.
I am interested in the load you are shooting, what is it?
300 grain xtp and i forget what powder i used. I think it was pyrodex p. ZERO SWABBING!
100 yards with a 410 grain great plains conical and 90 grains pyrodex p and no swabbing.
Some rifles want to be cleaned while others do not.