I have a buddy i'm helping build a custom rifle, probably a .260 or 6.5-.284, and am looking at krieger barrels to do the work as they absolutely NAILED my .260. (barrel and gunsmithing) question is, is the 5-r rifling worth it? Just what kind of muzzle velocity increase can i expect and how much better BC? (i've just read up on this and understand the radiused impressions from the rifling on the bullet jacket MAY increase the BC). anyone with relavant knowledge that has feedback is greatly appreciated.