Slamfire:

"Greased" neck/bullet is far different from a (very) slight residual coating of wax/sizing lube. Like you, I have found the latter to increase case life considerably (factors of 2-4 in some cases -- no pun intended).

The "grease" problem, however, was just that -- grease. Soldiers/competitors would literally dip the bullet into grease and chamber the round. Guess where the excess grease went as the round entered the throat? Bingo: Instant custom-fit/hydraulic/zero clearance in the neck area.

Bad juju.