The 45-70 has been around for a LONG time, you'll always be able the get shells for it. The 450 Marlin is a newcomer, and yet to establish itself. If shells are ever discontinued, the brass is oddball too. It's a belted case, but not the typical belted brass, the belt is thicker on the 450 Marlin, supposedly to prevent people from putting 458 Win mag ammo in their Marlins. The 45-70 factory loadings are tame, but reloading perks it up nicely. Maybe you and your friend could go together on a reloading setup?? Handloading will change the way you shoot for the better. Good luck, Eric
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