It's a bad idea. Differing amounts of recoil is going to make for some awkward follow up shots, probably worse accuracy and speed than if you just loaded .357 mag even if it's a little "much" for the shooter.
I've thought about having magazines with alternating HP and FMJ rounds, loaded with the same weight to the same velocity. To potentially have a more versatile HD weapon but it's often a bad idea to mix any kind of ammo, unless you absolutely need to.
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