I also think that it's worth noting that I have had hang fire problems in the past with the 300 wsm, and slower powders. Trying to make reduced loads. Some of them blew primers and some didn't.
That's also why I am weary of using light loads of slow powder in the wsm case.
Nosler's start load is 5 grains less than Hodgdons with this powder. And Sierra's start load is another 9 grains less than that.
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