The 375 Win is a nice deer hammer and in a Marlin it will carry like a 30-30.The Marlin 444 and 45-70 are heavier in the barrel and if carried all day you would without doubt notice the difference.The 375 brass can be made from 30-30 or 38-55 but be aware the brass is 20% thinner than 375 brass.The 375 runs at much higher pressure if loaded to its potential.I have also used Winny brand 38-55 brass at full length and cast bullets in my Marlin with great results.Bullets are the tough component to find at the moment as the two most common suppliers have cut production to catch up on more common bullets.Hawk does make the bullets also.I use the Hornady 220 must often.I have many of the calibers the OP listed,but the 375 is a favorite.Not sure I would hunt with the 50-100 as it takes two men and a boy to carry it.
