As the manufacturer of the Li'l Shaver Broadhead Sharpener I've sharpened hundreds of broadheads at shoots and shows across the country. I've sharpened about every two blade broadhead out there. In my opinion, what kind of edge really doesn't matter as long as it's sharp. I'm amazed at the dull broadheads that I've seen guys use over the years. Most of the dull broadheads I've seen seem to be the pre-sharpened, replaceable blades. Some come nice and sharp but others are dull and most guys don't even check them when they take them out of the package. They just put them on their arrows and head to the field.
Fred Bear always said that a file sharpened edge was the best for bowhunting. I had an opportunity to become friends with Don Thomas Jr., Co-Editor of Traditional Bowhunter Magazine years ago when he offered to give me my first "Celebrity Endorsement" for my sharpeners. Don is a Medical Doctor and Surgeon. We discussed the sharpness of broadheads in the past and he agreed that a file sharpened edge was the best for bowhunting. He said a lot of guys like a scalpel edge but he said most people don't realize that when a surgeon makes an incision he uses a new scalpel for each layer of tissue he cuts through. Each scalpel only makes one cut through a layer of tissue then gets disposed of and another scalpel is used for the next layer of tissue. He said that a scalpel is really sharp but it the edge is delicate and dulls quickly. When a broadhead passes through hair, hide and ribs before it gets to the point of where it does its work, a filed edge holds up better than a delicate super sharp edge.
Below is a picture of a fixture I made back when I was doing shows. I've only got so much hair on my arms and needed to show the sharpness of broadheads sharpened on the Li'l Shaver so I made this fixture that uses a rubber band to test the sharpness. This might be something that you make want to make to test sharpness instead of shaving your arms. As an IBEP instructor we always taught that veins are similar to rubber bands and if a broadhead will slide past a rubber band without cutting it, it will slide past veins and arteries too.
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