I doubt that you can see any difference at all between a 2 groove and a 4 groove barrel.

I find that 180 grain bullets ahead of anybody's 4350 work very well in my 03s and A3s, two or four groove.

One reason why the 2 groove barrel is sometimes supposed to be inferior to the 4 groove is that many of the 2 groove barrels were produced after the general specifications were relaxed, and many of them would not have passed inspection if the specs were as tight as those to which most of the 4 groove were inspected.