Hardened stainless steel neck bushing from L.E. Wilson, with .337" diameter, features a .003” taper for precision sizing.
The bushing can be inverted for emergency use or fine-tuning neck tension, as it is non-interchangeable with Forster or RCBS dies.
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.