When your able to make your own the different alloys will allow the hbwc's to be driven a lot harder/faster.
I cast my hbwc's to 11/12bhn and tumble lube them. These hbwc's can be driven @ target speeds (2.7gr bullseye 38spl, 5.0gr wst 44spl) or heated up with no problem. I had the cast hbwc's chrony'd @ over 1100fps with some different loads with no problems & good accuracy. I normally just use these cast hbwc's at target velocities like they were intended. I have make/cast/swage better bullets than these for hp's.
I find it interesting that in all the posts that everyone refers to old outdated mag articles on this subject (hbwc's turned backwards). And only the 38spl is talked about. This isn't the 60's, 70's,80's, etc, it's the 2000& teens & we as casters/shooters/reloaders have the ability to make our own lead & jacketed hbwc's.
Some cast 35cal hbwc's & jacketed hbwc's top:
44cal cast hbwc's & jacketed hbwc's bottom:
A cast hbwc fired from a snub nosed 44spl:
Some jacketed hbwc's fired from a 38spl & 44spl snubnosed revolver.
The revolvers these bullets were shot out of.
Old data/articles are ok but it's also nice to think outside the box and put yourself in a situation where you can make your own bullets. As many as you want, as hard or soft as you want, as large or small as you want, whatever lube you want. Or have the ability to make jacketed hbwc's for firearms that won't stablize the store bought lead bullets.