Having to hold high at 100 yds surely is odd. "Normal" seems to require holding the front sight top about 8-12" below the aiming point. Could very well be the ammo. Graf's does internet sales of the Hornady 7,7mm Japaneseicon ammo- quality is excellent! Price is quite reasonable, considering the alternatives. Roughly US$25-28 a box.

I just wont shoot anybody's reloads in my weapons except my own. And I don't trust me! But at least if something does go wrong it'll be easy to know who to blame.