I just got another pack of Magnus 160 grain heads from 3 rivers and, for the first time in all my years of buying broadheads, all six were really dull. I use a tri-stone sharpener to great effect, but on the coarsest stone I have I couldn't even start to get a decent edge. I haven't ordered broadheads in a while now, so are they always this dull these days or was this an anomaly? Also, what kind of sharpener should I use to get an edge started if my coarsest stone can't get the job done efficiently without losing 20+ grains on the weight? I am not a tech guy so I am out of the loop on any kind of mechanical sharpeners. Fortunately, I still have a ton of razor sharp heads that I can remove from other arrows, but I will need to sharpen these boys eventually. Thanks for any help I can get.