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bullets is built and sold by many bullet makers. 6.5 Creedmoor ammo with long, sleek, high B.C. 264/6.5mm cartridges like the 6.5 Creedmoor. 260 Remington is not as popular as more “modern”. And this takes us closer to the explanation for why the. Regardless, the basic rule is that the longer the bullet, the faster the rifling twist rate must be to stabilize it. Englishman Alfred Greenhill developed a mathematical formula for determining twist rates for lead bullets in 1879 and it still works pretty well today, although variations like bullet material, hollow points, etc., alter things a bit. The advent of elongated bullets in the first half of the 19th century changed rifling significantly because the long bullets required more spin to stabilize. Like a spinning top, a spun bullet resists air pressures pushing counter to this axial motion, helping the bullet stay nose forward on its original line of motion toward the target. This is because an object in motion tends to maintain that motion until acted upon by an outside force. Soon enough someone familiar with curved arrow fletching added a turn to the rifling grooves and voila! Accuracy improved. Paper or linen patches around the ball would squeeze into the grooves to seal expanding gases. The grooves provided space in which the soot could lodge. And it’s why single balls fired through smooth bores rarely go exactly where aimed.įixing this inaccuracy began in the late 1400s when German or Austrian gunmakers tumbled to the concept of cutting shallow grooves in bores, probably to offset carbon fouling. This is why bird shot scatters ever farther as it progresses downrange. That’s 686 miles per hour! If that atmospheric pressure is even slightly more significant on one part of the ball than another, the flight path will be altered. Even on a dead calm day, a slug stepping out at 1,000 fps faces a headwind of at least 1,000 fps. But slugs weren’t accurate because surface imperfections-dings, grooves, flat spots and such-led to inconsistent planing in the wind. They could be loaded with heaps of small pellets (birdshot or the larger buckshot) or a single ball (slug or bullet.) Beyond 50 yards or so, slugs hit harder and were deadlier than pellets because their mass retained energy better than did the smaller, individual shot pellets. Credit a slightly slower twist rate as well as a rather limpid PR campaign for the.
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fits the same action-length rifles as the 6.5 Creedmoor and pushes bullets about 100 fps faster, it languishes in the Creedmoor’s shadow.