I don’t think the 400 Swift will cycle through a Marlin, nose is too long. The 350 was designed for the 45/70 and has a short nose. Kodiak was about the only company making a really tough 400 for the 45/70 but now he’s passed and I don’t know if anyone is going to pick up the business. The old heavy jacket Barnes Original was a fairly stout bullet but who knows if you can find some.
