Velocity of the Longhorn pistol is only 577.5 m/s, or 0.75x the initSpeed of .308 ammo. This is way too slow compared to real figures and the weapon has low damage as a result.
Unlike, for example, the sawed-off Mosin (which has only a 10-inch barrel), the Longhorn barrel is not particularly short. Since it is a break-action single shot, it can pack a longer barrel into a shorter length because it does not require a bolt and feeding mechanisms, etc, behind the barrel. Many modern 7.62x51/.308 rifles, such as the SCAR-H, HK 417 or L129A1 have 16 inch barrels. The Longhorn has a 14-inch barrel (measured by picture of the 3D model in DayZ, a standard T/C Encore pistol barrel in real life is 15", the DayZ version appears slightly shorter)
The standard 7.62x51 NATO test barrel has a length of 22 inches, the same as the Blaze rifle in DayZ.
So we can compare to the Blaze the velocity of the Longhorn, and then compare to real life:
**Muzzle velocity as proportion of standard 22" barrel velocity**
Longhorn (14" barrel) = 0.714x
Blaze (22" barrel) = 1.00x
And now compare to some real and simulated figures for .308 fired from 14-inch and 22-inch barrels:
Bill Marr from RifleShooter.com found that a 22-inch barrel produced a velocity of 2837 ft/s with Winchester 147 gr FMJ .308 ammo. From a 14" barrel the figure was 2559 ft/s with the same ammunition, which is 90% as fast.
**Muzzle velocity as proportion of standard 22" barrel velocity**
RifleShooter.com test 14" barrel: 0.90x
RifleShooter.com test 22" barrel: 1.00x
To add a second source, the following load was entered into internal ballistics software "Gordon's Reloading Tool" (version 2021.1980.NIGHTLY):
Barrel length: 22 inches
Cartridge: .308 Winchester
Bullet: General Dynamics 147 gr FMJBT
Case capacity: 56 grains H2O
Cartridge length: 2.800"
Powder: 48 grains Hodgdon BL-C(2)
The predicted velocity was 2817.7 ft/s. Changing the barrel length to 14 inches resulted in a velocity of 2503.4 ft/s for the same load, which is 89% as fast.
**Muzzle velocity as proportion of standard 22" barrel velocity**
GRT 14" barrel: 0.89x
GRT 22" barrel: 1.000x
It is worth noting the kinetic energy is reduced by the square of the decrease in velocity, so a weapon that has 89% of the standard 22" barrel velocity will only have 79% of the kinetic energy.
But either 89% or 79% are both **significantly more** than the current ~71% velocity/damage as compared to the Blaze!