Thompson LaGarde did use a number of revolvers with lead bullets.
Given the velocities achieved by those rounds at the time, and the fact that they were either round nose or had small flat points, I SERIOUSLY doubt that there was any expansion at all in those bullets.
Any expansion achieved would likely be minor, at best, leading us right back to the T-LG's conclusions that at the time, bigger was better, because bigger was the ONLY way to get a bigger hole in the target, and a bigger hole meant more damage.
"Walt Welch, MD, said the expanding handgun bullet is largely a myth."
I don't know who Walt Welch is, what kind of MD he is, or how many bullet wounds he sees, but I'm really wondering if he's seen any of the new generation of handgun bullets at work.
I've seen photos of more than enough expanded handgun bullets, dug from humans (both living and corpses) to recognize that these AREN'T your Grandfather's hollowpoints anymore.