Factory ammo would be cheaper for the 243... You know in Cabelas or Basspro, or Wal-Mart they have 3006, 308, 270, 243, and the 3030 Rem, Federal and or Win ammo on the end of the rack... Sometimes for $15.00-$17.00 for a box of 20. However most times that would be with the 100 grain bullet for the 243...That would be for deer not coyotes.....