Re: New to Forster press and dies---problem.
The only press I've ever owned is my Forster CoAx, and it's the only way I've ever primed cases.
Are you priming with the press or with a handheld tool? If you're priming with the press I don't think there's a way to screw that up, so I'd take that out of the equation.
What kind of rifle is it we're talking about, the TAC30 in your signature? I'm asking because I'm not getting whether the dimples are appearing on unfired rounds after chambering, or you mean the primers appear to be cratered after firing. I'll assume unfired rounds have dimples after chambering.
I've used all kinds of dies in my Forster, including their own. I have noticed like others have that Forster dies needed to be screwed further into contact with the press jaws than Redding or RCBS to achieve the same sizing. I used One-Shot for the first three years I owned the press and switched over this year to Hornady Unique, a wax type lube similar to Imperial. Sizing has required so much less effort since switching from One-Shot that my only conclusion is that One-Shot just doesn't lube as well. Maybe try some different lube, Unique or Imperial are good suggestions.
If I got resistance closing the bolt when chambering FL sized rounds I would screw the die in just a tiny bit at a time until there wasn't any. Other people have better methods maybe, but this has worked for me, and is the simplest and cheapest way to set the dies to resize perfectly for your chamber. This advice is predicated upon the assumption that your brass has been trimmed, and therefore the length of the neck is not what is giving you resistance in chambering, and also that your brass is not work hardened.
