Bought a custom 6.5x284 from Chris Palmer and was very satisfied. Vangard Action with Wilson barrel and very good brake. Can shoot it all day. So far got it up to 3274FPS with 123gr Absolute Hammer using H100V.
Went out today to get some testing done with the .264 123gr AH and here are the results:
COAL was 3.042 and could have brought it out to 3.099. Used H100 Hybrid V. 6.5x284
26 inch barrel, CCI250 primers, new LAPUA brass.
51.9GR - 3162FPS
52.2GR - 3178FPS SD7 ES14
52.5GR - 3184FPS