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KMAX,
I believe if you go to IMR's website they will give you the proper way to measure your cases to use Trail Boss. I believe the sequence is, mark your case where the bullet you will be using is bottomed out, fill the case with TB to this point, and then use 70% of this capacity as your load. It's way more detailed in IMR's description. Just make sure you do this procedure with each brand of case you use. I know that Remington brass has less capacity than Winchester does.
Ralph
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