I've got to say I,m never quite sure about testing my blades. When I run a file across my blade tempered and untempered it seems to skate okay but if I really press in it does bite. How hard do you press? So it might be crazy but this obsessive hobby has resulted in a bag of knives heavy enough that I finally felt comfortable taking two of my latest builds (one 80crv2 and one 1084) and whacking them with a lot of force into a throwaway deer antler. I was surprised to see no damage of any kind. I've doubted my heat treat because I have never used a lot of force when file testing, just some steady pressure. Just curious how some of you are performing this test.