Crimp or not?

444shooter

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This question is for the big bore fans. Do you crimp all your loads for rounds like the .416 Rigby and .458 Win? If so, do you use a separate die or just the bullet seater crimp function.
 
I put heavy loads out of a 45/70. I have a Lee Crimper for it, and almost all of the other cartridges I load for, and I am a firm believer.
 
I'll crimp hunting ammo on .375 and .416 Rigby on rare occasions. Normally I will crimp the solids since they may ride the whole trip at the bottom of the mag while just the top soft gets shot over and over.
I'm a firm believer that if a crimp is required there wasn't enough neck tension in the first place and you may as well fix that problem first. A crimp is a poor bandaid for inadequite tension.
I'll crimp cast bullets that need to go through a magazine, anything for a tubular mag and everything for revolvers.
 
When I've chosen a bullet with a cannelure or crimping groove, I always crimp. Done properly it does no harm, and in theory at least will uniform the bullet pull weight making the ammo a bit more uniform. IMHO, the best results are observed when crimping is done as a separate step from bullet seating.
 
The reason I ask is because I am tooling up to reload for these two calibers and I like the Lee rifle crimp die, but they only make it for the .458 Win and not the Rigby. I am thinking of getting Lee to make me a custom crimp die.
 
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