Some zing is wrong here.
Your trusty ole' 1911 should not be leading up like that.
Lead swc are all mine has ever digested, by the thousands, and even after two or three hundred rounds in an afternoon, there's hardly a trace of lead.
Just a little in the throat area.
Bullet hardness match to velocity?
Bullet diameter match to barrel diameter?
Roughly machined barrel, especially at the throat?
Or maybe what's in the barrel is bullet lube.
Something is not right.
It should not oughtta' do that.
If your gun will feed them, it's hard to beat the accuracy of the 200 grain lead swc.
That's why match competitors use them by the zillions.