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Good advice from Puffin on sectioning a case even though we hate losing a case.
I never did that with my Swede. I made a guestimation of how far to cut into the shoulder neck junction.
Worse still...

I neck pre-turned my 6.5x55 SM brass for my AI but not primarily to prevent donuts but due to very tight neck (ridiculously tight) clearance which was fashionable at the time. I did cut into the...

Luke, I see on your other posting you are neck turning your new Lapua brass. Is this just to tidy it up or are you turning for a clearance based on your reamer drawing?