"...sold on buying the Forster bench rest 2 die neck set."
Forster's are perhaps the supreme dies but your die set choice is wrong. EVER reloader needs a Full Length sizer, neck sizers are optional. Ditto micrometer seater heads, they are ONLY a user convienence, they do nothing for the quality of ammo that can be produced.
Variations in OAL, or bullet jump, for a factory sporting rifle usually won't mean much until it exceeds a moderately wide window, typically from 7 to 15 thou wide. No matter the bullet, any OAL difference greater than about 3-4 thou is from poor loading technique, not the dies. Or press.
It seems you must be a raw noob? That's cool, we all had to start and none of us were born knowing any more than you, but it sounds like you're read a lot on the web or magazines and not from a loading manual with noob instructions; THAT reading should be your first task. Lyman, Lee, Hornady, Sierra manuals all have well written basic instructions and good illustrations as well as the data you will need to reload. In use, dies of a given type - Full Lenght, Neck sizer or seater - work so nearly the same that the same instructions are good enough for most users. And you have a LOT to learn and a LONG way to go before a neck die will have any useful impact on your shooting.