Originally Posted by
bronko22000
I beilieve what you are seeing is just the slight expansion of the case due to the bullet's snug fit. There is only a need for one roll crimp at the mouth of the case and this is only needed for a lever action or other repeater. The crimp would not be needed for single shots.
Bronko's right. I have had Remington factory ammo for the 45/70 and have never seen a second crimp. Any crimp below the bullet would serve no purpose. I also handload for that cartridge, and I too feel what you are seeing is the seated bullet slightly bulging the casing, which is perfectly normal. The only crimp that is necessary is the one into the bullet canellure if loading for rifles other than single shots, like bronko mentioned. Even then, I don't get carried away with too much crimp.