I am currently working on a 20 Practical. Sent a Savage LPV 204 Ruger barrel to Sinman and had it rechambered to 20 Practical.
So far, it looks very promising. I chose Practical over Tactical due to less cost for setting up dies. Already had s bushing type die for 223, picked up a .235 and .230 bushing to neck down the brass. Bought the 204 stem from Redding. Use my 223 Forster Micro seating die to finish it off. You can use 20 Tactical load data.
From what i can see, the only real difference between the 2 is shoulder angle and brass with a proper head stamp. Have you priced that brass yet? Lots of load data at
http://www.6mmbr.com/index.html

Good luck
Tony