I'm with straight arrow. If I were you I'd get one of the field tip kits from 3 rivers or kustom king and see if one works. They're pretty cheap.

http://www.3riversarchery.com/Produc...=0&i=CF5-T

Kustom king also has 300 grain field tips you could try.

I think you can find a weight and build a hunting head that will work for you with the right formula of insert weight, adapter weight and head weight.