Bartlien arguably has the best reputation for accuracy and consistency in barrel making. And they can do pretty much anything you want in a barrel. The last two barrels I bought are Bartlien, 5R gain twist. The 5R rifling is easier on jackets and produces less friction, the gain twist starts heavier projectiles spinning easier as well as continually sealing better all the way to the muzzle. I also went with left hand rotation to help mitigate coriolis effect in the Northern hemisphere. Very few makers offer, or can do this kind of work. I didn't have these two fluted, as I was more concerned with rigidity, but fluting does reduce weight and will generally be just as rigid as the "same weight" non- fluted barrel. I do like the looks of fluted barrels, and gave many of them. There are lots of options you can take advantage of in a good custom barrel.