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Rifles, Reloading, Optics, Equipment
Reloading
Can primers cause vertical stringing?
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<blockquote data-quote="Bart B" data-source="post: 821150" data-attributes="member: 5302"><p>Sorry Captain, but that's one of the oldest myths in rifle shooting on this planet. It stems from this common problem with commercial factory rifles and barrels. But 'tain't so with rifles put together with all the right stuff.</p><p></p><p>To many (hundreds, thousands) of long range competitors shooting 30 caliber magnums prone burning 65 to 70 grains of powder putting a 190 or 200 grain bullet down range every 20 to 30 seconds for 25 or more shots and never had even 1/2 MOA of elevation shot stringing way out to 1000 yards. Properly built rifles with properly stress relieved barrels do not nor never had vertical shot stringing problems. Best test of this was when someone put 40 shots from a Hart barreled Win. 70 in .308 Win. clamped in a machine rest down range once every 20 seconds or so. All those Lapua D46 185-gr. FMJRB bullets went under 2 inches on the 600 yard target.</p><p></p><p>Most common cause is the barrel's fit to a receiver that has a high point on its face and as the barrel heats up, that high point puts a stress line in that axis off bore center and the barrel whips more in that direction. It's often in the vertical axis but can also be in any direction. Once in a while, someone puts epoxy bedding under the barrel's chamber and this will definitely cause vertical shot stringing as the barrel heats up; but not as much as a poorly fit barrel. Usually can be fixed by facing the receiver face square with the barrel tenon thread axis then using a shim washer between the barrel and reciever so it clocks in right for headspace and sight hole alignment.</p><p></p><p>Arsenals testing good lots of 30 caliber match ammo shoot a couple hundred shots per test group. Every 20 to 40 seconds, a bullet goes down range in their test barrel. They all land inside a 6 inch circle at 600 yards. Not too shabby for such stuff that'll shoot under 1/3 MOA at 100 yards so tested. </p><p></p><p>M1's and M14's shooting that ammo in one match werein 24 shots are fired in 50 seconds also shoot it that accurate. But the guy shooting them that fast and reloading once with an M14 or twice with an M1 cannot get the sights back on the target too repeatable from shot to shot so the groups on paper end up about 12 to 15 inches when so shot at 600 yards. Somewhat smaller at the 500 yard stage where as many shots are fired in the same time limit. And these rifles have thin, tapered barrels, not thick, straight ones, too.</p></blockquote><p></p>
[QUOTE="Bart B, post: 821150, member: 5302"] Sorry Captain, but that's one of the oldest myths in rifle shooting on this planet. It stems from this common problem with commercial factory rifles and barrels. But 'tain't so with rifles put together with all the right stuff. To many (hundreds, thousands) of long range competitors shooting 30 caliber magnums prone burning 65 to 70 grains of powder putting a 190 or 200 grain bullet down range every 20 to 30 seconds for 25 or more shots and never had even 1/2 MOA of elevation shot stringing way out to 1000 yards. Properly built rifles with properly stress relieved barrels do not nor never had vertical shot stringing problems. Best test of this was when someone put 40 shots from a Hart barreled Win. 70 in .308 Win. clamped in a machine rest down range once every 20 seconds or so. All those Lapua D46 185-gr. FMJRB bullets went under 2 inches on the 600 yard target. Most common cause is the barrel's fit to a receiver that has a high point on its face and as the barrel heats up, that high point puts a stress line in that axis off bore center and the barrel whips more in that direction. It's often in the vertical axis but can also be in any direction. Once in a while, someone puts epoxy bedding under the barrel's chamber and this will definitely cause vertical shot stringing as the barrel heats up; but not as much as a poorly fit barrel. Usually can be fixed by facing the receiver face square with the barrel tenon thread axis then using a shim washer between the barrel and reciever so it clocks in right for headspace and sight hole alignment. Arsenals testing good lots of 30 caliber match ammo shoot a couple hundred shots per test group. Every 20 to 40 seconds, a bullet goes down range in their test barrel. They all land inside a 6 inch circle at 600 yards. Not too shabby for such stuff that'll shoot under 1/3 MOA at 100 yards so tested. M1's and M14's shooting that ammo in one match werein 24 shots are fired in 50 seconds also shoot it that accurate. But the guy shooting them that fast and reloading once with an M14 or twice with an M1 cannot get the sights back on the target too repeatable from shot to shot so the groups on paper end up about 12 to 15 inches when so shot at 600 yards. Somewhat smaller at the 500 yard stage where as many shots are fired in the same time limit. And these rifles have thin, tapered barrels, not thick, straight ones, too. [/QUOTE]
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Can primers cause vertical stringing?
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