Are you asking about the pre-season montec, or the Montec BMP?
There's no reason you shouldn't be able to use the preseason.
Edit, guess I should have read further.
@robby denning @realunlucky ,y'all realize some of these practice heads are exactly the same, just not sharpened right? There's several companies offer their heads without sharpening, I wouldn't think that would be an issue. They aren't different heads made "to fly like" the broadheads.
Maybe it's mudding the waters, but if can stick a fastner in a sevr to eliminate the o-ring, should be able to use a dull broadhead.