I think most Postings here have explained the same transition from TL - Lube-Sizer - PC.
I started TL sorta by accident. I have used a Lube-Sizer since I was very small. I have a hazy memory of putting a bullet on top of a sizing die for an older Brother to pull down on the handle.
Three years ago or so it fell to me to supply bullets too for My Cowboy Shooting Chiropractor. I was having trouble getting a proper size mold from Lyman.
So I bought a mold from N.O.E. it was a New TL design for them. I didn't realize it was a TL at the time I bought it. A #432-240-RF
Then the Lyman #429667 arrived and cast proper sized bullets.
Crimping the N.O.E. bullet over the ogive gave a shorter OAL, thus being able to fit 9 rounds into his WIN. 44 Trapper. So of course that's what he wanted.
The first 200 went thru a .430 Lube-Sizer. Minimal leading, 50/50 lube.
Another 200 were TL with WLL 45/45/10 and sized in a Lee .431 size die. Very minimal leading.
The last 200 were PC'd with Eastwood Squirrel gray, sized .431 in the Lee sizer, Dawn dish soap was used as a lube for sizing. Messy, but NO leading.
Then decision was made for PC, using a bit of Hornady Spray Lube for sizing. Far less messy.
500 rounds were made up. Cleaning guns showed no leading.
As far as case trimming goes, I had a friend who shot A LOT OF .223 in an MSR.
I did his case prep. All the factory (Fed) ammo He shot up was way too long. I sized them in an RCBS sm base die.
I used a Lyman powered Case Trimmer, with a Lyman Case Prep Express behind it. The combination allowed me to trim, chamber & deburr approximately 150 cases an hour. Ream primer pockets too.
A RCBS X-Die was then used for sizing.
And Matt would shoot A LOT of .223, He would go to the Range at lunch and burn thru 500 rounds.
I trimmed 5,000 cases in a year. PD's shot at the Range during the week, He picked up a whole bunch of .223/5.56 brass not to mention 9mm, 40S&W & .45ACP.
I really hate the auto-correct on this tablet.