45/70 chambers have no throat to speak of, so you need to select bullets carefully if you want trouble free feeding and function.
By way of example in the link below you will find a pic of various bullets - some are loaded to 45/90 length that do feed in my Browning 1886 in 45/70. This shows how versatile a 45/70 can be in an 1886 platform. The chamber is a stock no throat 45/70 chamber.
https://levergunscommunity.org/viewtopic.php?t=71103
