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Unless you’re experienced and can take pretty fine measurements, most people back off from lands 20 thou (0.5mm) and start playing with seating depth from there.

stagstalker have you got any 2217 spare?
Yea, red is max. But you could find your rifle doesn't mind over max. Seating depth in relation to lands will also affect pressure. Sorry for the shit image,...

Nothing wrong with a 22 inch barrel in 7mmRM. Pretty sure Duleys get decent results with 20" version so I wouldn't worry too much. Mate owns a 22" and regularly shoots 5-600m with no issues at...