It is difficult make a statement as to what is the proper number of lube grooves without knowing what the shooter wants from his loads. High speed or max accuracy with moderate speed.
Some of the winning CB shooters today use only one lube groove plus the check shank and get excellent velocity with steller accuracy, but they taper their bullets so the long nose doesn't contact the grooves as a standard bullet like my designs do.
Groove depth is not critical so long as it is a bit deeper than the rifling, except that groove shape aids castability and influences wheter the lube stays in place.
When using LBT bullet designs, and especially with LBT lube, which stands more stress than most if not all other bullet lubricants, fill only as many grooves as are needed to control leading. Precision target shooters will generally find that less lube give tightest groups if leading is being controled. But they will need to pay attention to ambient and barrel temperatures, or go home stumped if the weather turns hotter than when they developed their pet load.
The other side of the coin, and very critical to most shooters is the need for loads to work anywhere, any time, any weather, in which case, fill all the grooves on LBT bullets. Very little accuracy is sacrificed when a bullet is "overlubed", Everything is lost when underlubed.
