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I see the lead bullet as holding back pressure leakage better, but also having more friction loss in the barrel.
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It is good that you are curious, and you have a lot of misconceptions.
I'll start out with this one part: plain lead bullets have far less friction than jacketed bullets. A soft swaged wadcutter can be easily driven through a barrel, but a stuck squib jacketed bullet is a real problem.... Also, look at your tables and notice lead takes less powder for equivalent loads.
I'll leave the rest for others, except to comment that much of this information can be found in several good books and manuals on loading. Try looking up "obturate."