I use coton balls with Vaseline. it always burns well even when wet. the other advantage is that you always have Vaseline if you need it for medical purposes.
I have a savage 110 hog hunter in 350 legend. I shoot 180 grain winchester power point through it. also tested federal 180 grain power shock. pictures are a 4 shot group at 100 yards. 2 rounds of each. it puts great holes in deer size game.