Never really agreed with the BD admonitions. It's a great powder for moving 200-220gr bullets in a 10mm but not a 41mag????? If you are worried about your M57, load a few up at 11.5gr & see how that works, but 12gr w/ 215grLSWC wouldn't worry me.
10 mm 37,500psi
41 Magnum 36,000psi

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NRA Cert. Inst. IDPA CSO