Nose length is correct to fit Colt Frontier Six Shooter cylinder and to feed in Winchester 1873.
Substantial crimp groove adequate for smokeless loads to prevent interial dislodgement in revolvers, or "telescoping" from compression of tubular magazine spring in lever-actions.
Base-to-crimp length fits the .44-40 bottleneck with only the base bevel below shoulder.
Keith type large meplat, with radiussed nose for smooth feeding and full-diameter front band for improved game performance.
Adequate lubricant capacity for BP or substitutes.
Also useable in .44 Russian, .44 Special, .44 Magnum for those preferring a lighter bullet.
Kudos to Tom!
73 de KE4SKY In Home Mix We Trust From the Home of Ed's Red in "Almost Heaven" West Virginia