Fortunately, I also had enough left over ammunition from the previous test, so I was able to use the same four kinds of ammunition from the same lot numbers as the 26″ to 16.5″ test. Using the same barrel, I was able to control for the barrel and chamber. I wanted to control for ammunition and barrel. I conducted my first 223 Remington/5.56mm NATO barrel length test 17 months prior to conducting this one. The pistol is equipped with the excellent Timney Model 521 trigger and modified MDT LSS chassis. The bolt action pistol with a 5″ barrel (above). The rifle used to record data from 26 to 16.5 inches (above). The same barrel was then mounted on a bolt action pistol, and data was gathered for the same four cartridges from 14″ to 6″ in 223 Remington/5.56mm NATO Barrel length versus Velocity- Short Barrels- 6 to 14 inches. To recap how that data was gathered, in 223 Remington/5.56 NATO, velocity versus barrel length: A man, his chop box and his friend’s rifle, I cut a 26″ long factory Remington 700 chambered in 223 Remington back one inch at a time and recorded the average velocity and standard deviation for five shots of four different kinds of ammunition. The purpose of this post is to combine the barrel length and muzzle velocity data gathered in the ’s last two 223 Remington/5.56mm NATO barrel length experiments. Have you ever wondered how much barrel length effects muzzle velocity on your rifle? Well I did, so I cut up rifles chambered in 223 Remington, 308 Winchester, 7 mm Remington Magnum and 300 Winchester Magnum to gather empirical data.
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