Well, it's a wildcat...what did you expect?
See if you can find 204 Ruger data, see if you can find ANY 20 tactical for the same bullets, get out your calculator and take some notes on the percentage difference between whatever 204 and Tactical loads you can find. That will help you extrapolate what is going to be voodoo juju.
At least you should be able to get some idea of a targeted muzzle velocity. If you are getting "impossible" velocity, yep, something's wrong.
Don't forget to sniff around 20 PRACTICAL, see what THOSE numbers might indicate.
I guess that's the pain, and the pleasure of wildcatting, all the guesswork and thinking.
