Hardened stainless steel neck bushing designed for precise sizing in .001” increments with a .003” taper for fine-tuning neck tension.
Specific to L.E. Wilson dies and not interchangeable with Forster or RCBS, with a unique feature allowing flipping for tighter sizing in emergencies.
To select the correct bushing size, subtract .002"-.003" from the loaded cartridge's outside neck diameter or calculate based on case neck wall thickness and bullet diameter.