Will this rest have enough windage adjustment for the Allegiance also will Blazer vanes clear the rest?

I use one on a Patriot and windage is no problem and I don't shoot blazers so can't help you there. What I would tell you is to call them and talk to Nibal, he will help you out. Freat guy.

I'm using an APA on my Allegiance and it works great. I also have been shooting Blazers through it with no problems at all. This is one drop away I have never had a clearance problem with.