Possum Hollow Bore Guide #57i - .270 Winchester, .308 Winchester Fits Hall / Barnard P Actions with Integral Solvent Port Bullet Weight_102gr 375" so you would need

375" so you would need a

yet the gradual thickening along the bullet’s axis controls expansion and curls the jacket uniformly outward at high and low velocities

Allows the use of larger than 7/8"x14 threaded reloading dies in presses where a removeable factory adapter bushing is present

This is handy for storing the massive mat when it’s not in use

Possum Hollow Bore Guide #57i - .270 Winchester, .308 Winchester Fits Hall / Barnard P Actions with Integral Solvent Port Bullet Weight_102gr 375" so you would needPossum Hollow Bore guide align the cleaning rod centrally to the bore to prevent throat or rifling damage. O ring seals the chamber and prevents solvents from contaminating the action and trigger and helps to keep the bore guide firmly in place. Large replacement O ring fits all guides and solvent port. An integral solvent port keeps chemicals where they should be, and prevent them from dripping in to your rifle stock or bench.