The obvious answer is there are too many variables to predict how much we're going to lose in muzzle velocity
for each inch of barrel removed.
With a muzzle velocity
of 1025 m/s and a precision of under 1 MOA, the round is essentially intended for use by marksmen.
from a 20-inch barrel was 3,260 fps.
* .45-75 WCF--one of the many cartridges for which the Model 1876 Winchester was chambered, it consisted of a rimmed, bottleneccked case measuring 48mm which contained 75 grains of blackpowder that pushed a 350-grain lead bullet to a muzzle velocity
of 1400 fps.
This 180-grain, full metal jacket cartridge features a muzzle velocity
of 1,150 fps.
It is a fast load in terms of muzzle velocity
, but with No.
Calibre [mm]: 7.62 x 39 Feed: 30-rnd detachable box Weight, empty [kg]: 3.30 Length [mm]: 595 Barrel length [mm]: 400 Rate of fire [rds/min]: 600 to 800 Muzzle velocity
[m/s]: ca 900 Max effective range [m]: up to 1000
was just under 1,100 fps with 5-shot, 20-yard groups measuring just under an inch.
First, if you have muzzle velocity
(MV), then you also have ME.
hard cast SWC bullet sized to .312" has a muzzle velocity
of 1,215 fps with five shots in 1 1/2" at 20 yards.
You can get a 24-inch rifled barrel on that bird gun and manage 2,000 feet per second of muzzle velocity
and 3,400 foot-pounds of muzzle energy.