I never use hunting blades on targets and haven’t for 30 years. I bought a spin tester for my hunting heads a long time ago and I check to make sure they spin perfectly, or make adjustments until they do. Those heads are used for hunting solely. Also, since I use replaceable blades I replace them after I shoot a deer. I never use them twice...despite buddies telling me they resharpen the blades they shoot through deer. I might be taking it too far but it’s worked for me so I stick to it.