When you get to Edmonton to buy your bullets, ask to see a factory box of .45 long colt (Cowboy if they have some) and look at the crimp, duplicate what you see and it will be adequate for what you want.
crimping came into vogue way back in the late 1860's, not as a powder burning aid but simply to hold the bullets from being pushed into the case under pressure from recoil and the spring in the magazines of the early Henry, 1866 and 1873 Win rifles. If a bullet were pushed into the case any farther than the actions were designed to function with, it would lock up the gun, sometimes in a very inopportune time. As earlier stated, it serves the same function in a handgun, all old original pistol caliber ammo from that ere was crimped as it had an equal opportunity to be used in a rifle or pistol.
I wont argue H,s statements on powder burn, as I've never loaded a rimmed pistol cartridge in 45 yrs of reloading without crimping it. Even my ACP or 9 mill loads receive a slight "pinch" to the bullet just to make sure they don't move for some reason.
That all makes good sense they way you explained it.



















































