RE: transition from field pts to muzzy 3 blade 100 gr question, generally speaking?
Expect to have to make adjustments when you switch over.
I tried everything I could think of last summer and couldn't get my broadheads (Muzzy 100 grn. 3-Blade) to hit with my fieldpoints. I eventually just sighted in for the broadheads and left it alone.
Perhaps things will be different for you.