22 BHN linotype and 22 BHN heat-treated 50/50 wheelweights/pure lead are nothing alike in a .30-caliber barrel.
I can understand this now It just clicked.
Relating it to something I know.
I help alloy aluminum at work. It is basically the same Idea.
With Aluminum, Put more copper in it dissipates heat more. More silica it fills out molds better and gets a toughness. Iron, hardness, but too much and brittle, Strontium, it develops a spider web type grain. Ect. Some components can change 2 percent and not effect anything. While others .05 percent can spoil the whole soup. You put too much of any component in, it stops alloying and just kinda floats around in pockets in the mix, or starts absorbing the other elements out of the alloy, again ruining the mix.
One small change can effect how the aluminum handles stress, and moves under stress.
We have 30 different alloys we make, some are very similar, but one slight change makes it more suitable for one customer then another.
Figure Tin has the same effect of a toughness ( a Malleable type of hardness) as silicon has in aluminum.But the antimony and arsenic give it a more ridged- brittle type of hardness.
By controlling the amounts of these and tailoring them to the conditions the bullet is going to be under. We can maximize the effect we are trying to achieve.
I understand that a few lead alloys can get you a long way with many different options and help you get where you want to go. That a lot more than BNH affect how these work.
That fitment is the father of accuracy. Controlling malleability is the best, or at least the easiest way to to achieve the perfect fitment.
We can make up for quite a bit of alloy variance with powder selection, lube ect. Moving this and that around till we get it to work for our individual goal.
But a certain alloy will move better under certain conditions then another.
As you go faster and farther things get more crucial.
It is a game of sacrifices and gains.