Hunters-Supply, Inc. 505-289-9432. 
Website at:  hunters-supply.com
      click on picture to enlarge
These bullets are size .308 and are intended for the .308 air rifle.  There is a 115 gr. round nose and a 115 gr. flat point.  The round nose offers good aerodynamics for long range shooting and the flat point  makes a good hunting bullet for short range, because the flat nose would be more destructive on game. 
New, to be used is a 76 gr. flat point. 
The picture on the right is the .495 dia. bullets.  I have an explanation of it at the end of the .50 cal. rifle test article.
Hunters-Supply also has a range of cast lead bullets for cartridge reloading.
Their prices include shipping, ask for the Airgun Bullets.