How does a newbie tell a "good" mentor from an idiot? This sub-forum has some of the first, and a whole s#$%load of the latter!! Unless you see one of the idiots trying to hammer his bolt open at the range, or having to get stitches from blowing the mag out of the bottom of his handgun, most certifiable "ijuts" can come across pretty knowledgeable. Same as the internet. Sure, there is good stuff on the 'net, but there is probably more stupid, idiotic, mindless drivel than mankind has been exposed to in the previous ten thousand years!
At least if the OP can read, he can test what a mentor tells him against what Hornady, Sierra, Lyman, ABC's, say in their books. You know that a company that has been in business for fifty or so years isn't going to just throw stuff out there for @#$#%'s and giggles.