ASbobcat
Silver $$ Contributor
are any of the existing 22 or 6 wildcats significantly better at punching paper at 600 out of an ar15 mag?
You can find the answer for yourself by plugging the numbers into any ballistic calculator (JBM, etc). From experience with a similar cartridge (5.68DMR), one can assume 2900fps from a 30in bbl with 90gr.
I can save you time and tell you the short answer is "no", with the exception of the 22x6.8 which is virtually identical and is already available. The only real difference will be the availability of factory ammo.