Well, I purchased a Bartlein 1-7.5 twist barrel in 6mm / .237 bore. Scott Harris chambered it. My reamer has a .271 neck and a .140 freebore. I know that the 6mm "hotrods" i.e. 6mm Creed, 6 x 47 Lapua et. al.. can eat up a throat quickly, especially under the stresses of long shot string F-Open competitions. So, since I like "making things work", I took a different approach to powder selection. I wrung out the new 115 DTACs with VV N160. I wanted to use the coolest burning powder suitable for the job at hand. N160, next to N165, is about as cool of a burning powder as you can get. Well with a little "work", I got the DTACs to run right at 3085f.p.s. and groups at 300 meters (330 yards) of 10 shots in almost exactly 0.750"! Pretty dang good! Good enough for me to go this weekend to Capitan Range in New Mexico for their state championship. I will use my .260A.I for the 600 yard portion of the match (Saturday) and the new 6mm Creed at 1000 on Sunday! It should be noted that the Capitan range is one of the toughest ranges to shoot at! Violent winds, shifting winds and horrifying heat waves! But they run a great match and it is in one of the prettiest places in North America!