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Old April 8, 2013, 07:40 AM   #6
I.R.Chevy
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Join Date: March 2, 2013
Location: Little Smoky, AB
Posts: 23
I ran into the exact same thing as you did with my 300WSM.

You are lucky as I am usually seeing 250-350fps difference from advertised speeds and what my chrony tells me.

If you are shooting sub moa then start *SLOWLY* working your loads up a half grain or so at a time until your group begins to start opening up. Then you can find your optimal speed vs accuracy point.
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