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Superformance powder for 257, has anyone tried it?

Superformance powder for 257, has anyone tried it?
« on: January 19, 2018, 08:45:26 AM »
Curious if it will work for the 257 bee.

.257

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Re: Superformance powder for 257, has anyone tried it?
« Reply #1 on: January 19, 2018, 02:27:41 PM »
Yes with 115 Berger's.
Great groups but the  velocity spread was over 150 fps.
Mike

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Re: Superformance powder for 257, has anyone tried it?
« Reply #2 on: March 18, 2018, 04:41:24 AM »
I ran 66.1 grains of Superformance in my 257 Wby and got a tiny little group at 100 yards. I think it will safely take more powder. SF is nearly the same burning speed as H-4831 and RL-19 but is temperature sensitive.
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