Custom turrets are a gimmick and a constraint to actually hitting your target at extended range.
The further the range, the more atmospherics factor into your DOPE.
Custom turrets are pre-set for specific environmental conditions.
-->A limiting factor for shooting in any other condition than what the turret is calibrated for.
Custom turrets are pre-set for a specific MV and bullet's b.c.
--->Change a bullet and/or powder in your load, and your 'custom turret' just became a paper weight.
If you're shooting LR, there's nothing at all to rush about.
It doesn't take any longer to dial a standard turret than it does a custom one.
If your scope's turrets prove to be +/- the listed adjustments, you're basing 'custom turret' on flawed data.
Shooting LR is about accurate & PROVEN data input, for generating a repeatably accurate correction. Cutting a corner with a 'custom turret' might work for mid-range shooting, but is no benefit atop a legit LR rifle with a shooter versed in operating it.
I will concede that if all you're shooting is <600yds at a massive target like an elk, you'll prolly be OK. But it's still just as easy to have a pre-made DOPE card based on your "custom turret" info and dial a standard turret. Or, wrap a thin strip of masking tape around your turret, and mark it with a fine tipped Sharpie to make a "po-man's ballistic turret". At least that one you can peel off and change if conditions / load change...