RS Magnum and Retumbo are next to each other on the burn chart. I know Mule Deer favors Magnum for the .257

R-33 is supposed to be even slower with the properties of R-17, i.e. extreme weather tolerance and high energy.

http://www.6mmbr.com/reloder17.html

http://bulletin.accurateshooter.com...oder-33-and-power-pro-1000-from-alliant/

Azshooter on the fire has begun some load testing with it.

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dogzapper

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