AtlLaw, I have been casting and shooting my own bullets since about 1970 or 71. I too have read the articles, and have even tried the technique of pouring them you described. My conclusion? A pain in the bohind with VERY limited positive results. The soft lead almost always smeared off on contact causing dramatic bullet weight loss.
The expanding bullet vs the hard cast kill similarly, and yet differently. Both have penetration, while one (the hard cast) will usually out penetrate the expanding one.
For pistol and revolver, I have cast everything from 9mm (yuk!) to 45acp and 45LC. In rifle, from 30 cal to 45cal.
My final analysis is it wasn't worth the effort on the soft nose.
For 3030, I shoot a 170 grain round or flat nosed bullet of wheel weights and a gas check at 2400fps with no leading, and it is a bone breaker in the shoulders.
I long ago abandoned anything in handgun below 38 caliber, as I consider them (9mm) inferior as a fight stopper with personal experience as a reference. SO! I mold a 158 grain SWC in, once again wheel weights for EVERYTHING 38 cal. pistol or rifle. Once I surpass 1100fps, without a gas check some leading is going to occur. Some will say no, but I have my doubts. It's their call.
For 45acp, a 200 grain truncated bullet, 45LC a SWC in 250 grain, and in 4570 a 400 grain SWC. This last bullet I will load to about 1500, and experience no or almost no leading. Who the hell knows why, but I like the load. WITH A RECOIL PAD!
In an 1895 Cowboy, I will take on anything on the planet with this load.
Doubt I helped, but that's my experience. Go for a good shot placement, and break some bones with a plain ole hard cast. Critters and folks don't get far when their frame is all busted up.
Good luck.