The Collet squeezes the neck arround a mandrel which im pretty sure is part of the the de capping Assembly I have no experience with these dies in particular but my reloading Nelse would tell me it would certainly effect the dies ability to work affectively ether makeing the neck too small or inconsistent
Easy way to find out
Messure the od of the neck after sizeing with the decaping Assembly in place and
Then messure one after sizeing without
If the measurements are the same your golden
Though id Suspect the Measurement without will be smaller and therefore be too much neck tension
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