max grains with reloader 15 and 175 smk?

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I have used 42.3gr of RE15 behind SMK 175gr in new Lapua brass with a CCI BR-2 primer in a Barrett MRAD .308 with a 22" barrel, 2.800 OAL.
Here is the MV (measured @ 12ft from the muzzle) for 4 shots:
2473
2455
2482
2469
Always been clean burning in my experience. It is my #2 powder after Varget - a close #2.
I have had 0.5 to 0.75" groups at 100yds with this. With a Varget/168 SMK concoction I have achieved 4 shot groups of 0.35". I think the 175 can do better than I did - I need to try again (first time out with the rifle).
 
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