THE GUN MAY NOT LIKE THE POWERBELTS BULLETS ALSO WOULD SWITCH TO LOOSE POWDER CHECK OUT PERCISION WEB SITE .I HAVE A 50 CAL MADE BY C.V.A. IT SHOOTS GROUPS AT THE 100 YARD TARGET UNDER A 3/4 INCH GROUPS WITH PERCISION SABOT AND 110 GRAINS OF PYRODEX SELECT LOOSE POWDER.SPIT PATCH BETWEEN SHOT THEN ONE CLEAN PATCH NO SOLVENT http://www.prbullet.com/