WSM in .300 doesn't like anything over 180grains. It will consistently shoot sub MOA groups all day long with accubond or Barnes TSX loads.
Thats a myth. The 300WSM performs very well with rounds over 180gr., one of the most used target rounds in the 300WSM is the 208gr. AMAX, which I use. I load nothing under 200gr. in my 300WSM and get very good performance with Reloader 17.
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