MGySgt
Try this for what's being used in Afghanistan and Iraq....M16 ammo with match 70 gr hollow points from Hornady and Sierra both. Also M16 in 6.8 Remington. AR10 in 7.62 and of course your beloved M14's.
I believe it was the very short barreled M16 carbines that were having problems with penetration of distance target and that was with standard NATO ammo.
I'd imagine if we took this back to the Revolutionary War times the old vets then would have said "Yeah, give me my flintlock anyday over those new fangled whatever they are made of guns".
As I see military equipment gets improved as time passes on. Yeah those 30-06's and 308's were good back in their days and yes they can still wipe you out with one shot today, so can a Brown Bess Flintlock too. You know the Germans started to see the light too late in WWII when they came out with that STG44. Had they had that at the beginning of the war things might have come out differently...that is if their insane leader let the generals direct the war. Anyways all the equipment has gotten better, better comminications, better artilery, better aircraft, vehicles, ships...so why not rifles. If I had my choice in Nam today, I'd take the current M16 over the M14 any day and even better yet the AK 47.
Joe