Crafting of some types of ammo are made more difficult than others (via "unsafe places"), perhaps, to make it more rare and valueble. However, if you compare all types of ammo and weapons that use them you will see that 7.62 are not on the top. Ridiculous, .223 caliber far more powerfull in fallout universe, as well as some of the best weapons (sniper rifle, .223 pistol, light support weapon) use it as ammo.
I suggest to make .223 ammo craft available only in sierra army deport/raiders base, remove special requiments for 7.62 ammo that it can be craft on a regular workbench.
I dont want to say that .223-weapons imbalased or something like that, i just think that more powerfull weapons must be more difficult to maintance. For an example - minigans, they consume realy huge amounts of ammo, so there no need to nerf them in such way. .223 weapons is less expencive, so making .223 ammo a little more hard for crafting, will not affect game to much. While 7.62 weapons will become a "newbie choose", for those who don't want to risk in sierra, or don't know how to join the raiders
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Caliber .223 AC modifier -20
DR modifier -20
Damage adj 1/1
Weight 18 grams
Base price 18 caps
.223 weapons:.223 PistolDamage 20 - 30
Single AP: 5, Range: 30.
Hunting RifleDamage 8 - 20
Single AP: 5, Range: 40.
Scoped Hunting RifleDamage 8 - 20
Single AP: 5, Range: 40.
Sniper RifleDamage 14 - 34
Single AP: 6, Range: 50.
Light Support WeaponDamage 20 - 30
Burst AP: 7, Range: 40, Rounds: 10.
Caliber 7.62mm AC modifier -5
DR modifier -10
Damage adj 1/1
Weight 22 grams
Base price 16 caps
7.62 weapons:FN FALDamage 9 - 18
Single AP: 5, Range: 35.
Burst AP: 6, Range: 30, Rounds: 10
FN FAL HPFADamage 11 - 22
Single AP: 5, Range: 35.
Burst AP: 6, Range: 30, Rounds: 10
M60Damage 18 - 26
Burst AP: 7, Range: 35, Rounds: 10