Redding Reloading .336" Heat-Treat Stl Neck Siz Bsh #73336 Freely interchange in all Redding Bushing style Sizing Dies. By selecting the correct bushing, you are now able to provide just the right amount of neck tension to properly hold the bullet without excessive resizing. Available in .001" size increments throughout the range of .185" thru .368", covering all calibers from .17 to .338 and clearly marked with size I.D. Heat treated steel. The sizing diameters are hand-polished with a surface hardness of Rc 60-62 to reduce sizing effort .