I'm shooting a Winchester Apex with 2 50 gr triple 7 pelletsand 295 gr powerbelt bullets. Between 50 and 100 yards the bullet is dropping 6 to 7 inches. Is this normal? I'm shooting with iron sights so at 100 yrds I'm aiming best I can at center. This seems like a lot of drop to me and wondering if I just got bad results that day. This is my first time shooting blackpowder. Maybe I should up thepowder to 130 or 150 gr?