13 gr of LG is too much for my Ruger 77/22Hornet that has been K'd. It likes around 12.5 gr. At that level I see no issues. The only thing I don't love about LG is that it is dirty. Almost like flakes coming out a the rifling if doesn't get cleaned often. I have no experience with 300MP, but will probably try it once my supply of LG gets low.
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