MTM Short Actions 25 to 378 Wby. Mag Caliber Bore Guide for Bolt Action Rifle For .25 to .378 WBY Mag. Calibers; Fits Remington 700, 788, 40X short actions, Ruger 77 short actions and similar bolt sizes Assures perfect alignment of a cleaning rod to the bore Prevents solvent contamination of magazine and trigger mechanism Protects a rifle's finish If you're serious about cleaning your rifles these are a must!; Made in USA