Yes, Lee's BrC thread was excellent! Unfortunately, a collection of, "bullet maker" methods/concepts, solicited by [the late] Wilbur Harris (BrC founder) was, during a format change, "lost" in cyber-space. There wasn't a lot of stinginess displayed by the top notch bullet makers of that era - about thirty years ago.
This thread seems to be turning into something unusually useful - thank you, Al, and all who have contributed useful info.
Really, there are no secrets, nor, are there magic formulas involved: bullet making is a very simple, straight forward process. The "secrets" are simply attributes, procedures, etc. which, over time, anyone with mechanical aptitude, and uncommon (once know as "
common") sense will "discover" and assimilate.
The making of precision bullets does require the use of excellent jackets, tooling, and measuring devices - and knowing/learning how to use them. Patience, record keeping, and a good memory are useful attributes, and will facilitate acquiring knowledge.
Some knowledge just cannot be [precisely] shared, as the variables - touched upon in several preceding posts - are ever present, and this includes your die vs. mine: the two dies may "want" differing amounts of lube - yes even carbide dies!

So, one can provide a general amount of a specific lube formula, but the dies and Lot-to-Lot variation in the jackets may not be correct/desirable for both dies. The ULTIMATE goal, is UNIFORMITY - the variable set may make this a moving target.
While I'm rambling, with my current Lube Lot, and specific lot of thirty Cal., .925" long J4 jackets, to seat cores, I am using
2.0 Gr. of lube per 1,600 jackets (1.5 buckets) - 0.00125 Gr. per jacket. Consider the economy of scale: trying to apply a uniform amount of lube to a couple of hundred jackets becomes much more difficult target!
To put a fine point on it, were I to lube 200 of these jackets, they'd want .25 Gr. of lube - being "off" by a measly 1/2 of one tenth (0.05Gr.) would amount to a 20% variation . . .

Ten times the variation with the same "miss" for the 2.0 Gr. target.
Lube your jackets, at least, a bucket at a time . . . for core seating, my
current J4 6mm/.790"long jacket are getting the same 2.0 Gr. of lube, but for 1.5 buckets (nice fit in one gallon jar), or, approx. 3,900 pieces: 0.0005128 Gr. each!!
If there is any interest,
I may add a few more comments, but my info tends to be relatively boring . . . here's a good example. Hmmmm - it t's a video on my computer at home . . .
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