Bad idea, IMHO.
I shoot at an indoor range. Thursday night is play night for the regulars. The range has a steel plate rack. One evening one of the guys shot himself in the leg -- a fragment from a FMJ 9mm bullet ricocheted off a plate and hit him in the calf. It wasn't life threatening, but it did require a trip to the ER and stitches.
IMHO 10 yards is too close, especially for something like .357 magnum.
I disagree, look at the distances in the steel challange statges. The chance of a ricochet is present any time with steel. We have shooters shooting calibers from 22lr to 45 acp at our steel matches.
Example; Smoke & Hope stage- steel plates set at 21 feet ( 7 yards)
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