S&W M&P 360 Question

[1MAG1KiLL]

this is my first revolver, not a handgun expert or anything. did NOT expect this thing to have so much recoil with 357's. i recently replaced my cylinder after about 300 rounds of 38+p and maybe 100 rounds of 357's. i was reading about how each cylinder has to match correctly or have a certain amount of tolorance somewhere, well i just swaped it out for looks and maybe losing a couple of oz's/grams. my question is should i bring it into a gunsmith to get some kind of adjustment made or to get it or checked to make sure its in spec? next question is are these burnt marks on the cylinder normal?