T/C's .50 caliber Mag Express Sabots are designed to be used with .44 caliber jacketed pistol bullets, or lead bullets of .429"-.430" diameter. Mag Express Sabots load easily, and are designed to separate from the projectile quickly. This rapid separation means superior accuracy, as the projectile is influenced less by the "drag" of the sabot, while on its way to the target. They offer superior performance with conventional charges, or magnum charges of up to 150 grains of black powder or Pyrodex equivalent (or 3 Pyrodex Pellets). When using T/C's Mag Express Sabots behind magnum charges, the hunter can extend his range out to 200 yards. Per 50 Manufactures Website Address www.tcarms.com Warranty Information Limited lifetime warranty covers the product through the lifetime of the original purchaser, except in the case of obvious abuse or neglect.