[Unclenick]

The reason for crimping lever gun ammo is recoil pushes against all the rounds in the magazine back at once, which can stack up to a good bit of inertia pushing bullets deeper into the cases. Rounds fed from a box magazine or a removable magazine don't see nearly that much push. So crimping them is a good idea for that safety reason.

The Lee Factory crimp die works fine in this application. You can also use the crimp ring built into your seater die. If you want to use the crimp ring in the seater die you have, but avoid scraping copper off the bullet with the case mouth, seat the bullets with no crimp, back the seater ram out and adjust the die body to crimp as a separate operation. If the die you have is a Lee dead length seater from the deluxe die set, then it has no crimp ring and getting the factory crimp die separately would be a good plan.

OK. Scratch that last sentence. Lee doesn't make a Deluxe die set for this chambering.