Your right, most of this tinkering is done by hand loaders

For the 357 I load the Remington 180 grain SJHP and shoot them from a 1892 lever action that is threaded. Unfortunately this is a very hard to find projectile and I am down to my last few thousnad

I also load 300 grain JHPs in the 45LC for use in a Lightning Pump rifle that is threaded

I load 240 grain JSPs in the 10MM Auto for use in an integrally suppressed SMG

The 45-70 does not gain much over the 45LC if you are keeping the projectiles subsonic. You can load 400s into a 45LC and hit 1000FPS with it (obviously not for use in 100 year old revolvers), but it will work great in modern lever guns and pump rifles