You won't be disappointed. I have the TAC A1 in 6.5CM and, with the right factory ammunition (mine likes Prime 130-grain best; the other common match rounds are close behind), it will be remarkably close to custom ammo in custom rifles. Does a 1/4" group capability at 100 yards make me more competitive than a 1/2" capability? Not for the cost in time and effort to work up those optimal loads. Been there, done that, left it behind.
Regarding a scope, find one you like, then be sure to actually call the vendors shown at the bottom of the forum if you want to buy new. Trust me, it's worth your while to do so. If you are comfortable buying used, watch the Hide PX. You might consider the Vortex Razor Gen-1 5-20x50... mine might well appear there when the Gen-2 4.5-27x56 I have on order arrives! The Gen-1 has and continues to serve me well; the question will be whether it replaces one of the Gen-2 Viper PSTs on my other rifles...
Also - get a good bubble level with your scope. Others here may disagree, but I have the Vortex standard one on all my rifles. It's surprising how much difference a tiny amount of cant makes. Mounted well forward on the scope tube, I can glance at it from any position.