Try rio primers with blackhorn . Cleanest setup i ever shot by far in my triumph. 100 grns blackhorn,rio g-600 primer with 295 powerbelt in my 21” barrel tc triumph . Shot it 10 times last week. Last group was 1” at 100 yds. Ran a dry patch theu the barrel and it was shiny. Breechplug was black but just wiped it off clean. Breechplug canal was so clean a pipe cleaner showed no black at all .
