While I've not tried that powder, I have done quite a bit of testing in friends 350's. Alliant 2400 was incredible with 125 gr Maker Trex, shooting .037" @ 100. Friend was also banging 3" steel at 300 with it. Sure shocked me. Rifle also shot .262 with Hornady 170 gr.Shooters World SBR Socom (which is not a Somchem powder) is probably the single best powder available for reloading the 350 Legend.