You can soup up the loads pretty well but use caution. Use the loading data that is specific to the Marlin. The Ruger single shot data is too hot for the Marlin. The 45-70 in the Ruger 1 shot is only 200fps below the 458 Win Mag.
I used to load for both and had to keep the ammo separate and color coded. Do not use the really old shells as some were balloon head not solid head.
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"I would not be an old man if I had not been an armed young man." JTJ
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Last edited by JTJ; 10-26-2011 at 11:44 PM.