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Change powders or seat bullet deeper

6/284 30" brux bbl 8"twist . Today shooting 105gr Berger Hybrids seated just off the rifling lands , burning two powders Re# 25 and Magpro . I was getting tight ES in velocities (10'20' between shots) with both powders but poor accuracy in this new chamber( Non neck turning chamber). Others have said Re#22 is the go to powder for this cartridge ?
 
I have never shot a 6 x 284 BUT with "extreme" overbores, slow powders are the way to go. I would be looking at either H1000 or Retumbo. I have a load with my .300 R.U.M. that I do not use anymore. It was 92.0grs of RL-25 with a 200 Accubond. It shot GREAT with GREAT velocity>>>but after 15 or so shots, the barrel was so dirty that accuracy went into the toilet! I never seen anything like it before or since. I switched to Retumbo and all my "dirty" problems disappeared!

Since the 6 x 284 is in the realm of the W-A-Y overbores, the very slow powders in the H1000 / Retumbo and even VV N570 would be the ticket. Retumbo or N570 would probably get you screaming velocities to boot. I might add that those 3 powders are very clean burning also..
 
I'd play with the seating depths (both in and out) before changing powders along with NK tension. One thing at a time though.
 
The go to in my buddys was h4831 and I wouldn't be afraid to rel 22 as well.
 

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