Not enough information about whether or not you CAN use mechs for Elk......there are some I personally would use confidently, but I' ll tell you this much about the Spitfires: My Set-up is generating 80+ft lbs of KE and I wouldn' t use Spitfires on Elk. They' re strong and sharp heads, but slow opening and a bit to long on the cutting diameter IMO for even the more radical set-ups.