Take your unit(s) and all the search coils you have for it (them).
Select maybe a half-dozen modern and older-use sites that hold a lot of targets.
Take a note pad.
Grid some areas and search them with the coil you mainly use. Locate some naturally-lost targets and pinpoint them. Re-sweep the target and note the VDI numeric reading. Jot it down.
Next, change detectors and coils and sweep over the same target, after a proper GB at the site, and jot down the VDI reading for the same target with different coils
Continue searching for as long as you have decent, huntable weather. Log all VDI readings, and identify the recovered target (after checking with any/all coils) and the depth. Also, log the Ground Phase for the site where each recovery is made.
Be sure to log ALL targets, desired and junk, with the other information. Work at least the half-dozen sites, and grid them to hunt each grid completely.
Also, not if you had a jumpy or inconsistent VDI reading, making sure you dig those as well.
Finally, share that info with readers as it might be informative to them as well as you.
There are so many variables that can alter even a good target's VDI that you can't make a habit of referring to any ''list of lock-ons" or it will end up being a bad habit.
Just my biased and experienced opinions.
Monte