i have a Marlin 917 with a BSA Sweet 17 scope on it and i'm using remington ammo. here's my problem when i do my initial site in i'm dead on at 25 yds and then when i move to 100 i am way high and if i adjust down i'll be way low at closer ranges. i tried switching scopes and it still does this. Could it be the ammo? the gun shoots awesome groups, i just have this one problem. Any suggestions would be greatly appreciated because i'm about ready to get rid of this gun if i can't fix the problem.