Nosler Engineering

Nosler’s special lead-alloy, dual-core provides superior mushrooming characteristics at virtually all impact velocities.
Fully Tapered Copper-Alloy Jacket
Ruptures instantly at the thin jacket mouth, yet the gradual thickening along the bullet’s axis controls expansion and curls the jacket uniformly outward at high and low velocities.
Nosler’s Integral Partition
Supports the expanded mushroom and retains the rear lead-alloy core. The enclosed rear core retains more than two-thirds of the original bullet weight for deep penetration.
Dual-Core Construction
Every Partition® bullet in the Nosler® line delivers optimum length, weight and ogive design for maximum in-flight and terminal performance. 
Special Crimp Locks
Adds strength to resist deformation under the pressure of heavy magnums.