The Lyman Trimmer Pilot comes in a variety of sizes to accommodate a wide array of calibers. Trimmer pilots help the reloader prevent deformation and will guide the cutter for precise case trimming. Fits Rifle Calibers: 30M1 Carbine .30-30 .300 Savage .307 Winchester .308 Winchester .30-06 .300 WSM .300 Winchester Mag .300 Remington Ultra Mag. .300 Remington Ultra Mag SA .300 Weatherby Mag 7.62x39.