I THINK LOOSE POWDER IN PYRODEX WILL BE THE BEST CHOICE.I MYSELF USE SELECT GRADE.AS FAR AS BULLETS IT WHAT THE RIFLE WILL SHOOT THE BEST.POWERBELT IN MY RIFLE ARE O.K. BUT THE BETTER CHOICE FOR ME ARE PERCISION SABOT'S.IN THE 50 CAL. THE QT'S 40 IN 235 GRAIN ARE OUTSTANDING FOR LONG RANGE SHOOTING .START WITH 90 GRAINS AND WORK UP TO 120 NO MORE UNTIL YOU GET THE BEST GROUPS.GOOD LUCK THIS SEASON.