I'm a scardy cat reloader. Full power 10MM (like the Norma 170 gr.) is a very high pressure cartridge. Close to 37,500 psi. The 44 Magnum is 36,000 and available in an L frame only in a 5 shot. The 357 Magnum is 35,000.

If you bore out that 6 shot L frame 40 S&W to 10MM, please let me know where you are shooting it. I want to be at least 2 states away.

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SWCA 3417 HF 642 NRA-TC