I don’t think I’ve shot a factory load out of my handguns in over 30 years so I can’t say what a factory crimp looks like.
If you’ve got some factory ammo with cast bullets, if you have the means to do it, you might try reseating with a slightly heavier crimp to see how it works.
A couple of thousandths deeper wont make a difference.
Cowboy loads would probably be a lot cheaper and easier to get to practice with than jacket loads, if they work.
In what I've seen, the crimps aren't over a deep cannelured groove in the slug in the ones I've shot through it. I know some of the non standard grooved slugs are more substantial. If anything in the commercial stuff widely used, the slugs were passed through a light knurling. But for my Governor, the Hornady 185 FTXs are just fine. I won't be shooting anyone at 100 feet or more with them. In the governor, I can load up two 45 ACP in two moon clip, two .410 slug cartridges and two 45 Colts. That's about all I need in a night time pinch. :0)