The thickness of large rifle magnum and std cups is .027" in Fed. CCI, Rem. and Win. Regardless of Benchrest or non benchrest, magnum or standard; they are all the same.
It is only in small rifle that the thickness varies. How common is a small rifle magnum primer? Cup thickness does not vary on large rifle.
The orig. post was about a .270Winchester. That means we are discussing large rifle primers.
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