Educate Me

You'll have to find out which "lot" your WC820 is. There are three different lots available and they have slightly different burn speeds; WC 820 n, WC 820 pulldown, and WC 820 f (the WC 820 I have is 10% "hotter" than H110). I find a H110 load, reduce it by 10% and use magnum primers.
 
45Colt_Man said:
For WC820 use Accurate Arms #9 data, as usual start low and work up.

Dana

That's the safest way to so it, especially if there's some doubt about what lot you have.

Starting low and checking your loads with a chronograph is good practice.
 

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