Its too short to crimp in a regular die, or even the Lee factory crimp die.
When I first got my 45-70, I got some gummy tip ammo which is all I could get locally - at a King's Ransom price!!! (Convinced me that the only rational approach to this was to reload, which I really had intended to do from the start, since I have been reloading for other calibers for years). I just didn't have the dies yet.
Also another shooter gave me some Hornady brass.
When I did proceed to reload, I couldn't crimp any of the Brass I had!! Max trim length is listed as 2.105, and Hornaday is 2.040
I was given a LOT of old unfired WW brass that measures 2.095, and that works fine.
I discovered later that I can crimp the Hornaday brass using an old Lee Loader and the "bash with a mallet to crimp" approach.
Anyway, I am having a little trouble understanding why the Hornaday engineers couldn't have moved the channelure up a little further on the gummy tip bullet (like .055) if the overall cartridge length was a problem, so they could stay with standard length brass. Easier to shorten brass than to retool for different bullets I guess.