Hardened stainless steel neck bushing from L.E. Wilson is sized at .245" in diameter and increases in .001” increments with a .003” taper for precision sizing.
The bushing can be flipped for a tighter fit in emergency situations or for fine-tuning, but is not compatible with Forster or RCBS dies.
To select the correct bushing, subtract .002" to .003" from the outside neck diameter of a loaded cartridge or calculate using case neck wall thickness and bullet diameter.