Not "BESTEST" or "BEST" or "MOST STOPPING" or "WHIZBANG!" But...what do YOU consider (read: Opinion, math not necessary) to be the most efficient caliber? By efficient - I am looking for design of case/cartridge, accuracy (both short and far), recoil handling, and ease of wear on the weapon. For example - the 6.5x55SE I find to be a VERY efficient cartridge for hunting - it's smaller case size allows for a maximum charge with reasonable recoil. The long bullets can drive deep with moderate velocity (able to take game much larger than statistics should indicate), and it's use of smaller/lightweight bullets with high BC make for excellent ballistics. Also, being a intermediate cartridge with long seating, it can be chambered in any mauser-length long-action (versatility). NOTE: Cartridge is/should be handloading-friendly, and it's usefulness in this manner can be used as part of consideration.