As you all know, California is gone/going lead free for hunting and varminting. Perhaps for target/range as well but that's not what this is about. Rimfire lead free is unobtainable. Even if there were not a shortage due to more gun owners, there was always precious little lead free rimfire. It is all unavailable and availability looks to be a very long way off since other options for rimfire makers are in such high demand. 22 Hornet is a very viable option but the rifles it is offered in are not tickling my fancy, expensive or just not what I want. CZ 527 not what I want, Savage 25 does not excite me and Ruger 77/22 expensive. I have been noodling with several options beyond the 22 Hornet (std or AI) and the above 3. I have a 22 Hornet contender pistol and like it but not really keen on the lead free results. For a while, CZ and Savage had their models available in 5.7x28FN. That is more exciting to me as it is a rimless, bottleneck design. However, they don't seem to be available and I feel there are shortcomings to the .224 caliber lead free BC numbers. Factory lead free is avaialbe at ~$0.40 and reloading costs the same or lower than a 22 Hornet and lower than most lead free rimfire if you could get it. There is a 17/5.7-28FN wildcat but there are no component 17 cal lead free bullets. At the moment, there seems to be 3 brand/model of 20 cal lead free. vs. 7 or so for 224. I like the 20 cal offerings a little better "just because". The 204 Ruger is overkill for what I want. The 20-Practiclal and Tactical are a bit closer but still "too much" for my intended purposes. There is a 20/17-Remington but I already have a 17 Remington and it's still in the overkill area. I like the form factor of a 5.7x28FN but l I have a 223 Remington already so that doesn't fix anything. I have been playing with a 20/5.7x28FN. I bought some brass and dies but that is as far as I've gotten because.... I am undecided on barrel and action for the project. Looking at the stability calculators, which are of course not perfect, it seems I would do best with a 9 twist. This puts availability on the high end barrel makers as the lower end all seem to be 12 twist. As for actions, I'm sure I can make a Mauser or Rem 783 work and both fit the price range. There will be some serious work on bolt and extractor but everything is possible with time. It's the money I want to limit on this project. Other projects have worked exactly as intended but this one has more unknowns so I lean towards less expensive. any comments on the 20/5.7x28FN? any comments on twist as in can I get away with a 12twist?