Don't know if they are still in production but the 450 Marlin is an orphan it never took off in the US I know of one here, the cases are out of production you may find some ammo if you search
the gun shops,
Just buy a 45/70 there are still some of them popping up on Trade Me it will do what ever the 450 can with a 350 grain bullet it is only 100 fps or so faster
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