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Rifles, Reloading, Optics, Equipment
Reloading
Twist Rate Effect on Load Data
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<blockquote data-quote="Kevin Thomas" data-source="post: 781502" data-attributes="member: 15748"><p>ShowMeShooter,</p><p> </p><p>The effects of twist alone on pressure is negligable, usually on the order of about one-half of one percent. If there's pressure signs appearing, they're coming from other factors within the barrel, chamber or load. Twist alone isn't something to sweat as far as pressure is concerned.</p><p> </p><p>Here's an example; the original M16s were 1x14" twist barrels, which was later changed to 1x12". The standard ammunition (M193) is some fairly warm stuff; 55 grain FMJ @ 3,250 fps from a 20" barrel. When the military upgraded to the M16A4s and M4s, they went to a 1x7" twist, precisely doubling the twist fro the original issue M16s. Yet, the M193 remains in service as training ammo, and there's no problem whatsoever shooting it in the newer, fast twist rifles.</p><p> </p><p>It's not a problem.</p></blockquote><p></p>
[QUOTE="Kevin Thomas, post: 781502, member: 15748"] ShowMeShooter, The effects of twist alone on pressure is negligable, usually on the order of about one-half of one percent. If there's pressure signs appearing, they're coming from other factors within the barrel, chamber or load. Twist alone isn't something to sweat as far as pressure is concerned. Here's an example; the original M16s were 1x14" twist barrels, which was later changed to 1x12". The standard ammunition (M193) is some fairly warm stuff; 55 grain FMJ @ 3,250 fps from a 20" barrel. When the military upgraded to the M16A4s and M4s, they went to a 1x7" twist, precisely doubling the twist fro the original issue M16s. Yet, the M193 remains in service as training ammo, and there's no problem whatsoever shooting it in the newer, fast twist rifles. It's not a problem. [/QUOTE]
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Reloading
Twist Rate Effect on Load Data
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