What is the best powder for 22-250

You may not find this in any reloading manual, but LeveRevolution produces some pretty outstanding velocities in a 22-250. Use CFE223 as a guide, start low and work up.
I'm launching the 53 vmax at 3915 out of a 24" barrel.
 
New Tikka 8 twist .22-250
Loaded the following for test loads in unfired rifle;
New Nosler brass
Remington 9 1/2 M primers
Nosler 70 grain RDF blems
10 rounds / Varget
5 rounds / N140
5 rounds / Accurate 4064
At "50" yards benched, from a rest, they all shot into a jagged hole.
3 shots Varget-and all of the others. The jagged single hole spans 1"
Soup
 
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