300 win mag loading data

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WC860 burns too slowly for efficient use of a 150 grain bullet in a .300WM. or .300 H&H.

Sure, you can use it, but even with the case filled to the bullet base, you're going to get around 2400 fps. and lots of unburned powder in the bore.

As a reference, WC860 burns a little faster than H870. Look in your loading manuals and compare loads for H870 with 150 grain bullets.
 
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