I wonder if the six grooves get more blow by than 2 groovers and a lower velocity as a result?
And on the same/similar question, wouldn't a two groove barrel generate a lot more friction with all that surface area against the bullet case and be prone to problems like build up or faster wear? I realize of course that they went on and performed well over many years, but an experts comments on the possible downsides will be interesting anyway,
cheers