This is a SINGLE FEED bullet. Our Lazer line is a high BC, tipped hollow point hunting bullet designed for excellent long range accuracy and devastating terminal performance. These bullets are all manufactured out of lead-free, solid copper bar stock on a CNC Swiss style lathe. Because of our precise manufacturing process, we guarantee all of our bullets to be within 0.2 grain (for calibers .308 and under) and 0.4 grain (for calibers over .308) weight deviation between bullets in a given box. The Lazer line offers a high and consistent BC, making it the #1 choice for ELR match shooters everywhere. These bullets do not mushroom, but instead, fracture. After 1-2 of penetration, 3 large petals will break off and radiate outward in a star pattern while the base continues through for even deeper penetration. Our Lazer line will expand down to 1400fps. *If shooting through transonic, a twist rate increase of 1 inch is recommended (ex: 1:9 instead of 1:10) Technical Info: Caliber: .408 Weight: 425gr Required Twist Rate: 1:13 or faster G1 Ballistic Coefficient: .819 G7 Ballistic Coefficient: .419 OAL: 2.168 Projection Length: 1.542 Min Impact Velocity Required for Expansion: 1400fps