va ken,
Being that the 6500 scope is a SFP optic, the mildot reticle subtends true at only one mag setting, in this case, 10X power. Those turrets adjust in 1/4" per 100yds (IPHY), and do so on any mag. setting. The fact that the 6500's turret adjustment values don't 'match' the reticle subtensions is not ideal, but this isn't a scope I'd be doing much dialing with anyway. I only did so in the video to illustrate a point...
IF that scope had a FFP reticle, then I could have used that same reticle holdover accurately at ANY mag setting, not just @ 10X as in the vid. And therein lies the benefit of a FFP optic. The shooter can employ holdovers for elevation & windage corrections throughout the entire mag range of the scope. But that's a whole nutha ball o' wax...
Tom, if that Swaro scope is working for you, then more power to ya! I just don't see any 'problems' with a fixed marked turret, as you mentioned? NO sense in beating that horse into the ground, though...
The Swaro BT (and Kahles Multizero) designs essentially do what my aforementioned el cheapo '3M Tape ballistic turret' does. They both provide a visual marker for a specific yardage zero. And I agree with you that the BT's resettable markers make that system much more versatile than being limited by a custom made ballistic turret built around ONE load...
That said, the BT design limits the shooter to only 3 'marks', and only on the 1st revolution of the turret, at that. Again, too limiting for the type of shooting I like to dabble in...
Hope ya keep on poppin' them g-hogs and having fun