You have to trim the brass back because the fxt bullet is longer if your a reloader. They still jam in my 45/70 marlin with shorter brass. Since I have 3 45/70s to load for I will no longer be using that bullet.
They jammed in my Marlin at first. Changed out the magazine tube follower and haven't had a problem since. The new one is dimpled to hold the first bullet straight so things don't get out of line.
I have been looking at the Henry 4570.. What is a fair price for brass one ? I do like the Leverlution Ammo in my 35 Rem. So you say they Leverlution 4570 will work now in the Henrys? I like how the Henry has the tube magazine under the barrel. Not that the Marlin bad or anything..