2" at 100 is pretty good with winchester 40 gr bulk, for a bulk type ammo that is HV CCI blazers works well out of the BV too.

generally your match type and standard velocity ammos will produce better accuraccy / consistancy at 100 and 200 yards.

but if your happy with 2" with cheap bulk ammo (and you should be), stick with it. if you want to shrink groups down to 1" to 1.5" at 100, you'll probably have to pay 2 to 3 times or more per box of the "better stuff".

however with the "better stuff" you generally know that it's you that may have threw a few shots off rather than just shrugging it off as a fliers.