If you do a little research you'll quickly discover that the 308 has inferior ballistics when compared to a great many cartridges; pretty much any 6, 6.5, and 7mm. The biggest reason I shoot a 308 is because it is eligible for most long range competitions and mandatory for some; I've had my arm twisted. The 308 does have a few things going for it though. Quality factory ammunition is readily available (hand loading not required), a plethora of readily available information, quality components are abundant, extremely wide choice of rifles, long barrel life, tame recoil (rifle dependent), healthy resale market (for previous reasons), easily rechambered to a more efficient cartridge when your barrel is shot out; 260 Remmy looks pretty sweet and is only a barrel swap away.