Not sure what you mean, are you saying its labeled by Ruger? That mould design has been around for a long time & is a good one in the 41 maggie depending on powder charge. If its someone else's handloads, & it about has to be then you might want to pull a bullet & see if you can identify what powder its loaded with before shooting it. I know I would. Shooting someone else's unmarked handloads is kind of scary.
Dick