Bart B
Maybe all of your dies seat the bullet straight, but seating depth determined by a bullet contact at the tip is not uniform. Maybe you sort all of your bullets for length. I have a friend, we built 6.5 WSM rifles together, ordering barrels from Bartlein at the same time, who sorts all of his 130 Accubonds to the ogive, not the tip, to length. He used a Sinclair tool expressly designed for sorting bullets this way and found that his 300 yard groups shrank to under an inch. He is hunting with his 6.5 WSM and has two deer to date taken at over 500 yards. This is not the easy way. I do not know anyone else who sorts his bullets to ogive length. I avoid the extra step but avoid the 130 Accubonds. Both of us use Wilson seaters that were made with the chamber reamer from blanks.
The Wilson seating die and some others with aftermarket VLD stems will seat bullets much more uniformly in depth in the case (and just as straight as your RCBS wonders).
When I attend 600 yard benchrest matches at my club, I always ask others about how they are preping brass and loading. I see a lot of Berger VLDs in use. I do not recall any RCBS miracle seating dies in use. That goes for the RCBS "Competition" sleeved die as well. I know a shooter at the club who has abandon the RCBS "Competition" die after use in several calibers.
I am using the Montour County Metplat tool, to uniform the tips on 6.5 Berger Hunting VLDS but I still would rather seat by the ogive then by the tip.
What Long Range hunting bullets do you find seat so straight in you dies and how do you sort and prep them?