Okay, I'll bite.
Using a technique explained and demonstrated by mannyca on youtube at
https://www.youtube.com/watch?v=TC2Ad3k3kgg I made some 240 grain .44 jacketed bullets from .40 S&W brass.
They work. Just be sure to anneal the .40 S&W cases to make them really soft. You don't want your barrel worn out by overly hard brass. I have some Tempilaq heat-sensing paint on order that I can use to make sure the brass has reached annealing temp.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
I made up a process display board to explain the sequence. Use a strong press like a cast iron Rock Chucker. The process is pretty easy, really.
The kicker? A guy at my local gun shop found one of my expended brass cases splayed like a daisy and brought it back to the gun shop. He asked the guys there "What is this?!"
I had told the guys what I was doing and they said, "Hey! I know who made that!"
Later I showed up at the shop and they showed me the .40 S&W case all splayed out. I showed them what I had done.
All you need is raw lead slugs from a 175-gr Lee mold (
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1 ) that you swage into a .40 S&W case that's been annealed and trimmed to .700". You swage these into a 7mm Mauser sizing die that has the decapper removed using the ram from a Lee .429 push-through sizing die.
Be sure to lube the case well using a lanolin/beeswax/castor oil mix that comes out like peanut butter.