I bought a like new - but used, MARK 4 M1 turret, TMR reticle, .250MOA
Mounted this on a SAKO 6PPC and prepared to sight-in @ 100 yds.
Needed an additional 1/4 inch RIGHT and would have been finished the sight-in job. One click RIGHT and the bullets began printing 1/2" too far
I immediately did a "tracking" test by shooting every four click intervals.
The bullets did not print accordingly in 1" intervals.
The bullets varied spacings were 1-3/4", 1-1/2" and 1"
I'll be re-doing this test as I was short of ammunition and would like to monitor barrel temperature and conditions.
I've overlooked doing a scope tracking test for many years.
Especially with all the multitude of Leupolds that I own.
My Nightforce scopes track 100% as sighting-in is usually completed with a handful of shots.
I spoke to LEUPOLD service on the phone and they admitted that TRACKING is never 100% ....and isn't considered a scope malfunction under their lifetime warranty This is an huge "eye opener" as I never considered to have to look backwards when shooting LEUPOLD
Of course once your rifle is sighted-in with any scope then you're good to go as long as you aren't twisting knobs.
I'd like to know how good or bad your scope tracks...