A little late on this, sorry. I have only put 80 sabot rounds downfield with a .50 cal Thompson triumph, The rifle was cleaned really well as per APP directions, made sure to be clean of grease and solvent before priming with a single stick of Shockey Gold, There was no need for cleaning during the day to shoot, but I did find it easier to start the sabot down the barrel about every 20th shot or so if I ran a brush a couple inches into the barrel, as I said, this was just to make the seating easier, wasn't critical or even needed. I liked the Shockey compressed charges but will have to wait to get the rifle back before I try the APP pre-measured loads.