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Vincent, you want the 45-70. The 450 Marlin is a "Belted" Cartridge and the 45-70 is not "Belted". They are similar in size but not interchangeable. Picture here (you can view the belt at the bottom of the 450 Marlin on the right) : https://www.google.com/search?tbm=isch&sa=1&ei=0EkwW-G1OMXWzwKNg6TgDQ&q=450+marlin+ammo+vs+45-70+gov&oq=450+marlin+ammo+vs+45-70+gov&gs_l=img.3...13563.14706.0.14978.4.4.0.0.0.0.262.407.0j1j1.2.0....0...1c.1.64.img..2.0.0....0.4dxc-NfJtvQ#imgrc=bzoYYkH1qQmepM:
Vincent, you want the 45-70. The 450 Marlin is a "Belted" Cartridge and the 45-70 is not "Belted". They are similar in size but not interchangeable. Picture here (you can view the belt at the bottom of the 450 Marlin on the right) : google.com/search?tbm=isch&sa=1&ei=0EkwW-G1OMXWzwKNg6TgDQ&q=450+marlin+ammo+vs+45-70+gov&oq=450+marlin+ammo+vs+45-70+gov&gs_l=img.3...13563.14706.0.14978.4.4.0.0.0.0.262.407.0j1j1.2.0....0...1c.1.64.img..2.0.0....0.4dxc-NfJtvQ#imgrc=bzoYYkH1qQmepM:
you need the 45-70 the 450 marlin is a different cartridge and will not work in your gun
