I'm curious if anyone has paid extra for more grooves or just rolled with the standard 3?
I haven't, mine have all been 3's. Might try a 4 one of these days, just for the heck of it.
I was going to do that just because 4 is "normal", but having tried the 3 I think it may be superior. I shoot A-Frames out of mine (.375 WSM), which tend to be high pressure because it's hard to engrave them into the lands - the partition is too hard to compress. But on this barrel they behaved much more like a cup & core in terms of pressure. I think it's because there's not so many lands and none of them are directly opposed. The partition just doesn't get compressed as much.
It's a sample of one, but I got better results than I expected.
