Since I was unable to make the 600 yard Nationals I decided to twist on a new Brux 12 Twist chambered in a 6 BRA with a .270 neck and .075 FB. (Barrel work done by Tim Claunch) Gathering info from Jim O’Hara and a couple others including the gentleman that took his very own 12 twist BRA and won in his class fireforming brass at a UBR match (Mr Larry Moore) I began testing using XBR 8208 and started out with the Federal 205 primers and further did testing with various other primers I settled in on using CCI 450. Then I began testing with bushings and at the time I was using the Berger 80 that were HBN coated and settle on the .265 bushing. Later I changed over to the Bart’s 80 FB naked as the HBN was giving me eratic velocity readings. Once I changed my ES and SD numbers equalized out and I was more satisfied with the results. Although at 100 yards in the pics posted on testing bushings, primers and Powder charges the groups were very promising, but I knew they never hold up out farther. Here are the Powder tests groups As you can see as Powder went up the groups began to do the same. All these were 3 shot groups. Next post will be primer testing.