There are more than a few guys competing in PRS with 22BR/GT/Dasher/x47/creeds. For the closer matches with less wind, its holds its own.
You can easily shoot to 1k with that setup, but big targets and mirage are going to make spotting iffy.
Biggest issue is spotting hits especially on ranges that are stingy with the target indicators.
I personally wouldn't run one as you arent saving much money, and burning barrels up quicker with an overbore. Similar powder, similar bullet cost ,ect. The cost savings can be had running a .223 with the heavies, using half the powder. Good bullets are still .40-.50 each and primers are around .10 each. Barrel life amortized with a 22 creed vs a 6BR is like .50 per shot with the 22 vs like .30 per shot of barrel life with a BR (assuming 1500 with 22 creed and 2500 with BR). You will probally run less powder in the BR as well, saving some money per shot. You can download the 22 creed, but that kinda defeats the purpose of running it in the first place, and with a low case fill %, tuning a load is going to be a bitch.