So I’m looking over the Federal Ammunition ballistic charts (neat free software) and it seems that at 300 yards (the longest range near me) there's only small differences between the .223 & .308 in; bullet drift @ 5 mph, bullet drop, and bullet velocity. However; the .308s have around 30% more foot pounds at 300 yards (1,700 f-ps) than the .223s have at the barrel (1,300 f-ps)! Item: The Philippine Marine Corps Scout Snipers use DPMS AR-15s (24" Heavy Stainless Steel Ultra Match barrel w/a 1/8.5" twist) chambered for 5.56 (65-75 gr.), not 7.62. (I don't know what the standard barrel length is this data is generated from, but it seems that after 20" you've more than reached diminishing returns as far as increasing muzzle velocity with additional length. I'd be surprised if 24" barrels are used.) Granted, you’re not going get 1k yd ranges, or even 500 yds, in the rain forest. Still with all the lions and tigers and bears, Oh my! in the jungle, you (me) would think you’d (me again) want something that had more than a few hundred foot pounds left in it when it hit the target. Especially if it has to fly through branches & leaves & battle jackets and stuff without being deflected. Discuss.