The primary use for this bullet is in Ruger #1 rifles chambered for 45-70. The lighter weight and subsequent higher muzzle velocities, together with the lower initial opening velocities of the bullet, makes the #1 a viable 200+ yard bear, bore, and elk gun. The bullet will withstand anything that a 458 Winchester Magnum can dish out, but the sectional density may be a little low for initiating up close and not so friendly confrontations with a half-ton of brown bear. That situation would be better served with the 458-400 grain bullet.