I believe the gain twist Bartleins are a very slight gain. I order gain twist barrels with a moderate gain (ie. 15 to 12) but I have one, a 6.5 on a hunting rifle, which starts at 24 and finishes at 8. Whether or not there is any measurable benefit in any performance aspect, I can't honestly say. Ultimately, a good barrel is a good barrel, regardless of rifling configuration or rate of twist. GD
