I recently acquired a Browning A- Bolt in .270 with a BOSS. It really only has about 19 inches of usable barrel. Total barrel length is 21 1/4 from recoil lug to end of BOSS. Anyway, under the recommendation of a well known contributor here, I have been experimenting with 4064, and RL9, using 130 horn. Interlocks, and 140 Berger VLD's. With 49 grains of 4064 and a 130 interlock, I am getting 2923 ave.when I use 57.0 grains of RL19, and 140 VLD, 2889 average.Extreme spread was 88, ES was 32. Accuracy was very good at 200 yds. Just over an inch. With the 130 interlock, speed was 2923 ave. ES- 16, SD- 7 . Should I concentrate on the 140' or stay with the 130? I don't think I am going to get much more velocity. What do you think guys? (Derek, ?) Thoughts? AIM SMALL, MISS SMALL. 7 STW. lightbulb. Thanks.