Hardened stainless steel L.E. Wilson neck bushing with .001” increments and a .003” taper for precise neck sizing.
Can achieve tighter sizing by flipping the bushing, with markings facing the case, for emergency use or fine-tuning.
Two methods to select the correct bushing size: subtract .002"-.003" from the loaded cartridge's outside neck diameter or calculate using case neck wall thickness and bullet diameter.