Inspired by Hunt:Showdown's fantastic gunplay I decided to try and implement the most important part of what makes that combat so good in as simple and vanilla firendly way possible. Being able to 2-shot anyone with any gun, and be 2-shot in return, is in my opinion the cornerstone of "swordfight-like" gun fights.

Health is now determined by END only, with only 25 HP gained per END.

END     HP
1          125
2          150
3          175
4          200
5          225
6          250
7          275
8          300
9          325
10        350

Gun damage is significantly increased and standardized by ammo caliber. Since New Vegas also has the factor of NPCs wearing Armor, Larger caliber guns and shotguns have been adjusted to compensate. If your character is a weak milksop, armor up. There is also an optional Armor Values plugin that increases the DT of armor significantly, details further down.

Caliber                 Damage
.22LR                   75
9mm                    125
.45 Auto               125
10mm                  150
.357 Magnum      175
.44 Magnum        200
5mm                    175
5.56mm               175
12.7mm               225
.308                      250
.45-70 Govt          275
.50MG                  300
20ga                     225
12ga                     275

Laser and Plasma based damage has also been standardized

Laser Pistol        125
Laser Rifle          175

Plasma Pistol     150
Plasma Rifle       200

There is an optional Armor Values plugin to bring armor DT to a level that to me seems appropriate balance-wise and lore-wise. In general, armor falls into specific categories and are also standardized.

Category          DT
Amateur           15

Leather             25
Helmet             10

Combat            50
Helmet             15

Metal                75
Helmet             20

Power Armor  100
Helmet             25

Requirements - Yukichigai Unofficial Patch - YUP

Install - Extract into your Data folder