Okay here's the scenerio,

I have a Hawken's 50 cal and it's pretty accurate at the ranges I've sighted it in at. No matter what load I put in it, it behaves the same way.

Sighted in at 100yds. If I shoot at 5Oyds or less the maxi ball drastically climbs higher. I don't mean a few inches I'm talking 18 inches or more. 100 grains of 777 it should be flying pretty flat and at most from what I've researched a maximum of 6" or less. I've even changed it from the standard iron sights to a peep and globe set up. And it still behaves this way. I have a lyman .54 and it does not behave this way. Beings I've shot muzzleloaders most of my life this is news to me. I've not come across this before to this extent. Am I crazy, uneducated, or could it be I have a barrel drilled off angle? I'm scratching my head on this.

Enlighten me please.