500 Marlin
My mistake, the 500 does qualify under the new state law for case length. The 460 does not. I was very surprised to see Hornady's advertised external ballistics for the 500 S&W , and using their pointed "evolution" 300 grain bullet for tube mags, to be (from a 10 inch barrel) 2075 fps and 2868 ft pounds. Wish I had a formula to convert to 22 or 24 inch barrel, but my guess is 2300 fps and 3000+ ft pounds. I've seen no trajectory tables for this but it appears to be the best of factory rounds to meet the "dumb state law". Remember, until this week this state required shotgun, muzzle loader, or certain handguns, so I see this as an opportunity.
I don't know if the Marlin actions ("Cowboy" or 336) would take the pressure of some of these, like the 454 Casull or if the ejection port is large enough for the 500 (.556 rim, .526 case). I would rebarrel the Marlin and re-bolt to try it out if it is doable. (I know about the Puma 454 carbine) First choice for aesthetics would be the Marlin Cowboy, with the octagonal barrel. I don't know about the action strength though. Anybody?
Also, I'd like to investigate making a wildcat such as a 50/35 or 50/30. Would that work with existing barrels rechambered? How could I get started with such a project and where to get formulas for accuracy potential and the like? Easier than a rebarrel and rebolt? That would really be fun.
Is there a source of formulas to figure potential pressures, velocities, trajectories, shoulder angles, twist requriements and such? This could be a whole lot of fun, but I haven't the expertise to determine if it's feasable. If it is, who makes custom dies and cuts custom chambers? I suppose any good gunsmith could do the rebarrel, (if there is such a barrel) and bolt?
Thank you for the interest. Didn't mean to make this so long.