Hello Ray,
Sounds like an interesting rifle.
Try this link. Lots of info. and should get you going. I also shoot a .20cal. It's a custom Nesika 20Tac. I like the 20's. 
http://www.6mmbr.com/20Caliber.html#20PPC
 
Volker

Hello Phil,
I see it has been a long time w/o any replies. So thought I'd drop you a note. Hope someone finds it interesting.
Well, no recent experience w. T22. But at our Club matches, part of the curriculum is 22BR shooting, year round. You will see target grade ammo used made by Lapua and Eley. Most of the time it is Center-X or Match EPS. We shoot the IBS50 target at 50yds for a 500pt match. We've had several shooters make the 500pt grade. There are 10 matches to the series, leading up to a final Championship match at the end of the season. We all try our best; try not to take it too serious...but serious enough, and we all have a good time. And there is always some homemade tasty sweets on hand to sweeten the bitter taste of defeat, LOL
The vast majority of rifles being used are Anschutz in some form or another, so you can see why higher grade of ammo is being used to wring out the best in the equipment and from the shooter.
We also shoot Centerfire BR, but use the 100yd Varmint for Score, and not grouping.
Check out our club website some time: Petitcodiac Sportsmens Club,  outside of Moncton, NB
Wishing you good shooting!