Does anyone happen to know the hardness rating on Zwickey and Magnus broad heads. My Zwickey heads are near 20 years old and are fairly soft (never knew there rating) meaning they sharpen very well with a file/stone. I have absolutely no problems with them, I like them.

However I would like to give the Magnus ( 125/non vented ) heads a go and would like to know there hardness rating to know how I want to approach sharpening them.

Changeling