Sorry I missed your OAL for your rounds???
coffee's ready ,, Hootmix.
I'll agree with Coffin Maker ----double feed sez round too short - forget the book specs and load to suit the rifle.
Using blackpowder? yees? use enough powder compression to support the rounds from "turtling"
maybe forget the crimp groove and crimp into the top of the lube groove or just crimp wherever is best length for the gun
needs some crimp to turn the neck of the case in or else that will hang up on the chamber mouth .
My Uberti (45/75 rifle) has a quite noticeable chamfer on the chamber mouth
I cut some of my cases short and crimp into the top of the lube groove.
If I make em full chamber length and crimp over the ogive = use the powder column to support the boolit position - that works too
blackpowder makes life easy assembling rounds for lever guns.
I get your frustration!!!!!!!.