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[/align]Yooper, he may have been talking about penetration. Certain mechs. will out penetrate certain fixed blades. It sounds wrong , But you need to figure for cutting surface drag. I shot a Muzzy 3 blade 125 gr. at a block that had never had a shot put on it. At the same time; I shot a Rocket steelhead 125,4 blade at the same target. The Rocket out penetrated the Muzzy by1/4" . I determined this by measuring from the face of the target to the end ot thecrossbow bolt. [ I wasshooting a crossbow back then]. I tried this three more times with the same result. It's all about blade surface drag. By the same token;I wonder how much more it would have penetrated if it didn't usek.e. to open the head. By my estimation , Snypersuse less k. e. to open thanmostother head. They don't go against the motion of the arrow to open and they aren't as hard to open[when working properly] as the Rage heads. [/blockquote]