what is the barrel length of the rifle? If it's between 20 inches and 30 inches (which it most likely is), shooting a hunting load of 100- to 120-grains of Blackhorn 209 with a saboted 300-grain bullet, the above ballistics data should give you some idea of the muzzle velocity and muzzle energy produced by the rifle and load. Before each new shooting session, we would shoot to make sure the rifle would print "Dead On" at the distance of the chronograph, which was set at 25 yards to prevent the chrony from being hit by a sabot. Factors that can affect muzzle velocity include: Bullet grain, cartridge power, and barrel length. This is usually measured in feet-per-second (fps) and determines the power of the gun. Each time the barrel was shortened by two-inches, we made sure the muzzle was square to the bore, and put a light crown into the bore to make loading easy. The definition of muzzle velocity is the speed of a projectile the moment it leaves the barrel after being fired. Note that in order to use the lower thimble for an appropriately shortened ramrod, I had to actually shorten the front of the thimble as well. The muzzle of the now 20-inch barrel can be seen in the lower right hand corner. The photo directly above shows the different cuts we made to the barrel, comparing it to an uncut VORTEK StrikerFire LDR barrel. However, there is a place for a fast handling short-barreled rifle, and we will expound on that in a future article/report. sharing how two more inches of barrel, from 20 inches to 30 inches, increases velocity significantly. Instead of spotlighting the negative side of a shorter barrel, we'll consider this report positive. That is clearly shown in the ballistics data directly above this photo of the shortened VORTEK StrikerFire LDR barrel. 50 caliber in-line simply cannot obtain the same level of performance as the same exact model with a longer 28- or 30-inch barrel. It's simply because that with identical loads, a carbine length. There's a reason why shorter barrel length in-line muzzleloaders have failed to catch on and sell like hot cakes. (Note the cut off marks on that barrel in the photo directly above.) Then, on subsequent early morning shooting sessions, with the temperature within a 50 to 60 degree (F) range, I would shoot the same variety of loads with the barrel shortened to 28 inches. beginning with the barrel at its production 30-inch length. 209 primer ignition VORTEK StrikerFire LDR models. I talked my good friend Tom Hall, president of Traditions Performance Firearms, into sending me a brand new 30-inch barrel for one of the company's No. From year to year, it has been a stellar performer.īack six or seven years ago, I set out to establish how barrel length affected the velocity of this nitrocellulose based black powder substitute. From all of that shooting, I've concluded that Blackhorn 209 has been the most consistent black powder substitute that modern muzzleloading hunters have ever known. and with subsequent years of the powder produced since 2009. That shooting was conducted with both the early prototype of the powder. In other words, despite very similar mass, the MkVIII could travel faster and longer while maintaining kinetic energy.Beginning even before Blackhorn 209 hit the market back in 2008, I have spent many hours shooting various charges of the powder and various weights of saboted bullets across several different chronographs using barrels of 20- to 30-inches to determine velocities during a variety of weather and temperature ranges. 303 British despite being heavier, the MkVIII's boat-tail design increased muzzle velocity 5-20% and increased pressure 7.5-54%. ”Your physics are off, otherwise planes would only be able to maintain altitude by pitching upward.Īlso, the drag coefficient is only one part of the ballistic coefficient. if it takes one second for a bullet to hit the ground from 1 meter at 100m/s its gonna take 1 second for it to hit the ground at 2000m/s. things like drag simply slow the bullet down and cause that curve to compress. Muzzle velocity and energy are often stamped right on ammo packaging. A bullet should always take the same time to hit the ground regardless of muzzle velocity unless another force is acting upon it due to gravity. ↑ “ This is mostly right, except normal bullets dont gain much if any lift from increased muzzle velocity, that normally only happens with back spinning spheres.
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