Lee Precision BackCountry Crimp Die Features The Lee Precision BackCountry Crimp Die is built specifically for the 7mm Backcountry cartridge and its .284 inch bullet diameter giving reloaders a dedicated tool for finishing rifle ammunition with a dependable crimp. Lee s factory crimp die design applies pressure more firmly than standard seating dies which is why bullets without a factory crimp groove still benefit from noticeably tighter accuracy once run through it. The firmer crimp raises the pressure required to start bullet movement and that higher start pressure is what produces a cleaner more consistent pressure curve shot to shot. For reloaders chasing smaller velocity spreads and tighter groups this die addresses one of the variables that often gets overlooked. Built for rifle caliber reloading presses this crimp die is sold as a single die rather than as part of a multi-die set making it a straightforward addition for shooters who already load 7mm Backcountry ammunition and want to improve consistency. The crimping step it performs happens after bullet seating locking the case mouth against the bullet to prevent movement under recoil or during feeding. This is especially valuable for hunting ammunition that may ride in a magazine through multiple chambering cycles before firing. Reloaders working up loads for this relatively new cartridge will find this die a practical way to extract more consistent performance from their handloads. Lee Precision BackCountry Crimp Die Specifications Manufacturer: Lee Precision Model: BackCountry Crimp Die Caliber: 7MM Backcountry Bullet Diameter: .284 Reloading Die Type: Crimp Die In Set: 1 Gun Type: Rifle Available At: GrabAGun