FIRST I WOULD SAY GO TO LOOSE POWDER.THEN MAYBE YOUR M/L DON'T LIKE THE POWERBELTS BULLETS.I HAVE A 50 CAL. AND WHEN I TRIED THE POWERBELT I ALWAYS HAD A FLYER ON PAPER AT THE 100 YARD TARGET MAYBE A DIFFERENCE OF 5 INCHES .3 SHOTS WOULD GROUPE THE NEXT ROUND A FLYER @ SO ON.WHAT I FOUND IS THE PERCISION SABOT THAT I SHOOT NOW IN MY 50 CAL.@ MY 54CAL M/L.ARE THE BEST.WITH A QT 40 SABOT IN 235 GRAIN POLT TIP AND A CHARGE OF 110 GRAINS OF PYRODEX SELECT @ A NO# 11 CCI MAG CAP.GUN SHOOT AT THE 100 YARD YARGET 3 SHOT GROUP INSIDE A 3/4 SPREAD OR BETTER. BETWEEN SHOT CLEAN WITH A WET PATCH(WATER)OR SPIT AND FOLLOW WITH A DRY PATCH.USE NO CLEANING SOLVENTS ON PATCHES.CHECK OUT THERE WEB. PAGE PERCISION BULLETS YOU WON'T GO WRONG