Well I'm going to post it here since it gets ignored all the time:
Some of us like realism, we are all well aware that this game can not be very realistic, but at least some changes could make things easier for us to look at:
Sniper rifle using .223 is completely silly: make the sniper rifle use the 7.62*51mm.
.22 long rifle is not a high power round, this should be the least powerfull round, ever.
USM3A1 has a shorter barrel than most thompson models, and a slow firerate. Decrease its power below the thompson for both firemodes, magazine capacity to 30 rounds, and rounds per burst to at most the same as the M60 does (USm3a1 fires at 400 rpm, not even close to the m60 600rpm).
Mauser C96: This weapon was known to be very expensive to manufacture, And for its insane firerate of 1000 rpm for a pistol, and for using very powerfull ammunitions, Either 6-10-20 rounds magazine, this pistol should have a burst mode for very short range, emptying the entire magazine in one burst, it should require more AP to reload it due to the way it should be reloaded.
If you want the raiders to have a gun, equip them with .44 revolvers: they are reliable and requires little maintenance.
M60: why can't people run with it ? Also change the description: the M60 was known to be very unreliable until the last versions.
FN Fal: It should be very powerfull due to its ammunition, its damage should match the m60 damage per bullet, remember, the gun doesn't kill, the bullet does.
Minigun: Change the descriptions, the firerates stated are completely ludicrous, or make the miniguns empty the entire mag in one burst ... Also, people shouldn't be able to run with a minigun if they can not with an M60.
ALL MELEE WEAPONS: It is well known that knives are more lethal than guns, statistically: 1 bullet out of 10 will cause a lethal injury, 1 knife-stab out of 3 will cause a lethal injury... knives are 3x more effective than bullets are. Also: all police forces know that if someone is charging you with a knife from less than 12 meters away, you should consider yourself dead, for even if you kill the person charging you, the nervous system will still carry on for a few seconds. Millitary personnel are taught that they should consider themselves dead if someone is charging them from less than 20 meters away. Also: Bullet proof vests are not cut-proof. Penetrate perk should apply to "thrusting" weapons which also have a cutting edge.
If you want ballistic tables, comparison of guns / ammo / barrels or theories, you could simply ask, if that's what holding you back from correcting the silly things in the original fallout games, I am certain there will be many people willing to help with that, offering more opinions on realism or whatnot. I know I'm not alone to think the weapon system should be revamped, and I believe a simulacrum of realism is a good way to get most people happy.