Thanks for the explanations. I have shot many rounds of 357 Magnums and I know some 125 gr ammo. Never had any issues, in my Model 19, 28 or newer 60s. Maybe I’m just lucky. The picture does look like a blowout/burn more than a crack or maybe a crack that allowed hot gases to open it up. I’ll keep an eye out though and be more selective on magnum ammo.
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