15yards?? are you sure this isnt an archery range. Just a hair off one way or the other at 15 may be off the paper at 100. I wouldnt waste any more ammo shooting at 15 yards if I were you.

50 yards would be the minimun I would use to sight in a rifle.

Dway I read both your posts and it seems like you are having some probs with getting set up. If you want you can PM or email me and I'll give you any help you many need. Sounds like you need some TLC on getting going.