A fine article, not just for the strategy tips but a useful reminder of when exactly Stone's bullet bonus kicks in. The link below is one of the first things I check to remind myself of when various things happen during a Shootout: https://dtdb.co/en/structure#slingin-lead.
I think I lean towards Grimme for competitive play, but I like the flavour behind Stone and look forward to making some decks where I see how many permanent CP/bullet tokens I can gain.
I found he worked well with Bounty Hunters despite the clause requiring you to add a non-token dude to trigger the bullet bonus. If you've got a cheap dude without influence you can throw them and a Bounty Hunter at your opponent and have a 4-stud with little at risk beyond the 2GR and card you've used on the Bounty Hunter.