The Tau 7 is a great pistol, but if you could find one new in box for 400 then enjoy hair bands because you're back in the early 80's. Try 600 or more. 400 or more easy for used, they hold their value.
.22 is a peculiar caliber because most serious target work is done with .177, are you sure you need .22 philthy?
If so, a modded 2240 is for you. It's a bolt action single shot that can be tuned for amazing accuracy with an aftermarket barrel.
Both of the above will shoot...literally, through one hole. (if clamped in a machine rest).
I've got an smith and wesson .177 repeater that's more precise than my .357 magnum Dan Wesson target revolver, which is also very tight.