Almost all the PNC cones from Centuri are about .2 or .3 inches shorter than the original balsa ones. The ogive balsa cones were not very "mass producable" in plastic so the sharp tip was rounded, making the length shorter. They never went back and updated the kit overall lengths (or weights) on all the ones I checked that migrated from balsa to plastic nose cone.

Centuri nose cones

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Carl McLawhorn
NAR#4717 L2
semroc.com