My wife and I both shoot NAP spitfire mechanials 100 gr. 3 blade. you can get pratice blades for them,they just don't open on impact(the pratice blades that is ).
I have found they shoot just about the same.I can't tell any difference on my shooting.out to 30 yards.I can't stack'em but a good 3" group.I have been shooting them ever since they came out, no problems for us.

you will diffenently need to shoot and check any broadhead for you and your bow.good luck on you search.