M29 since 14 is a savvy poster, follow what he says. The Scandium guns, when firing .357M, can have a problem with bullets in unfired rounds pulling out under inertia when the gun is fired. This has happened in the slightly lighter PD series, possibly also occurs in the heavier M&Ps. It has happened to me with my 2001-vintage 360 with titanium cylinder.
The 442 should not have this difficulty with any .38Spl round, but testing is always in order. While I prefer the finish of the 642, the 442 is close to a perfect gun for pocket work. IMHO.
Stay safe, partner.

Kaaskop49
Shield #5103