I use the Hornady Cam Lock Puller. I did 50+ cartridges of 44-40.
For me, it was a little tricky to get it setup right, but once setup, it did the job quickly and i didn't notice any real deformations. This was for cast lead.
I spent my first months as a smokeless cowboy, then moved to frontier cartridge, then got caught up in frontiersman after shooting a borrowed set of pistols.
Belching fire and smoke, nothing else like it. For pistols i sometimes wait, but with the right rifle….shoot through the smoke.
I too moved away from the bang and clang to the powder inc.
Looks like the original from powder inc is out of stock but you can still buy version 2.
https://powderinc.com/product/cylinder-loader-2/
Same as Lucky for me.
Going by what three foot Johnson said, I’m guessing the 5 1/2 ROA’s have a slightly different setup and use a locking cross pin. My 7 1/2 ROA’s don’t require a screwdriver just push in to release like a Vaquero.
I have a 750. Having 5 stations vs the 4 of the 550 enables me to load app and filler without having to remove the case as I did with the 550. It’s a tight fit for two powder dispensers but it fits.