Greetings, I'm going to shoot a mil surp bolt rifle match for the first time in years and will have to use once fired 303 brass. I know the common wisdom is to neck size only then use a body die to knock things back when chambering gets tight.

Question, this match has rapid fire stages and I'm worried about proper feeding using fired brass. Should I use a FL die and try and get a measurement off the "shoulder" and knock that back 0.002"? Or will the once fired and neck sized do?

I'll be shooting my '55 Faz No4Mk2 that was a mummy wrap number. Headspace has been tightened up to commercial specs.
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