yeh,, I did same thing, first revolver, bought high end smith,, got it home, shot like doo doo warmed over had same garbage on end of barrel... Gun wont shoot for snot,, needs to have muzzle crowned.
S&W QC is total ****,, they suck
I musta put at least a couple thousand rounds thru my 4" 686 and the muzzle crown is a sharp edged work of art compared to the muzzle of the PC 686 in the pics.
May be the source of your woes, having looked at the photos. But not my first choice. Nor even my third. I've found most accuracy problems start rather further back.