As Mark said, both will work. The Sierra has a 3% antimony lead-alloy core, while the Hornady has a 4% core, plus the Interlock ring--which may or may not make it tougher, though I have a few "expired" Interlocks in my collection that are expanded right back to the ring and no further. But at the standard .30-06 muzzle velocity of 2700 either will work.
Like Mark, I have used more Hornady Spire Points (going back to before they had the Interlock ring) but lately have been using a lot of Sierras. When started at moderate velocities they work pretty darn well!
Last edited by Mule Deer; 11/24/08.
