The mark of a hunting rifle caliber is how well it kills game at distance. Most shooters use energy as a predictable index. The 6.5 CM 147 gr eld-x is 200 lbs greater than the 25-06 11 at 200 yards. At 0ver 400 yards the 25-06 117 SST interlock is less than 1000 lbs which many consider sub par for deer;while the 6.5 CM is1428 lbs at 500 yards.