Crimping big bore rounds

No I measure the overall length to set it and use the lock nut to keep it tight. I seat all of them, then switch it to crimp. I have went to the lee FCD because I like it better. No worries about bulged cases from over crimp, and it’s pretty easy.
 
This is basically what I do for my .458 Lott. I've also had a range session where I kept the bottom two in the magazine and never fired. Then came home and measured. No compression.

YMMV
I have been roll crimping my 458 Lott loads with Hornady dies and have not been putting a heavy crimp on the with no issues as well.
 

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pajarito wrote on Altitude sickness's profile.
is the parker shotgun still available?
Waterbuck hunt from this past week!

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Here's a photo of Tony receiving that Shaw & Hunter award at the 1970 annual EAPHA Dinner Dance. Tony Dyer, then EAPHA President and Princess (Sunny) von Auersperg presented it. I also attended the event.
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