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Old December 15, 2012, 09:36 PM   #8
GeauxTide
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Join Date: April 20, 2009
Location: Helena, AL
Posts: 3,050
With the expansion ratio (case capacity versus bore diameter) of those two cartridges, H4831 is going to be the slowest to get decent velocity. You'll be dissapointed in the results of the two you mentioned. For example, my 280 likes RL-19, IMR4350, and IMR4831. I load for a friend's 270 and it likes IMR4831. Magnum primers are not necessary until you get to a case capacity of 70gr.
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