So its more a false shoulder than a donut, if it chambers well then it shouldn't be a problem . Iv seen 2 rifles that needed neck turning after necking lapua down to 708. Measure the outside of a fired case from your rifle and a loaded round using your necked down brass. You will need to have some clearance to be sure of consistant functioning. .002 at least for a bolt gun, most of mine are around the 3-4 thou mark.
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