.357 caliber is 9mm.
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Almost but not quite. 9mm bullet is .356 and the 38 spl and .357 mag are actual .357.
About a dozen people including me have already pointed out that the 9mm is typically .355, not .356.
If you are shooting 2 inch groups with open sights on a mini-14, then Ruger needs to sign you up as an exhibition shooter. Either that or pay you several thousand dollars for the rifle so they can study it.