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Rifles, Reloading, Optics, Equipment
Reloading
Testing Loads? Help
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<blockquote data-quote="Bart B" data-source="post: 621170" data-attributes="member: 5302"><p>Plastics and other synthetic stock materials had problems when they first came out. When used on M14NM's and M1A's, they warped enough in the hot sun laying atop ones shooting bag to cause a 2 MOA change in impact at all ranges. With those stock's front end fitted to a ferrule on the barrel and receivers well epoxy bedded, the pressure on the barrel played hell with zeros. Some folks reported that after starting a string of 20 shots in prone at 600 or 1000 yards, they went through a 2 MOA change in zero; sometimes more. Fortunately, the later synthetic stocks were better. Never seemed to have that problem with wood stocks heating up in the July afternoon sun.</p><p></p><p>And yes, clearance around the barrel in a bolt gun is critical. One needs at least 1/16th inch and 1/8th is better. Winchester made some of their sporter stocks' fore ends with a gap wide enough (3/32nds?) to keep warping ones from putting pressure on the barrel. But too many folks thought they looked too ugly and/or was afraid something would get down in between the fore end and the barrel and cause problems. Winchester quit doing this; they chose to cater to folks who thought a perfect, tight close fit was best.........</p></blockquote><p></p>
[QUOTE="Bart B, post: 621170, member: 5302"] Plastics and other synthetic stock materials had problems when they first came out. When used on M14NM's and M1A's, they warped enough in the hot sun laying atop ones shooting bag to cause a 2 MOA change in impact at all ranges. With those stock's front end fitted to a ferrule on the barrel and receivers well epoxy bedded, the pressure on the barrel played hell with zeros. Some folks reported that after starting a string of 20 shots in prone at 600 or 1000 yards, they went through a 2 MOA change in zero; sometimes more. Fortunately, the later synthetic stocks were better. Never seemed to have that problem with wood stocks heating up in the July afternoon sun. And yes, clearance around the barrel in a bolt gun is critical. One needs at least 1/16th inch and 1/8th is better. Winchester made some of their sporter stocks' fore ends with a gap wide enough (3/32nds?) to keep warping ones from putting pressure on the barrel. But too many folks thought they looked too ugly and/or was afraid something would get down in between the fore end and the barrel and cause problems. Winchester quit doing this; they chose to cater to folks who thought a perfect, tight close fit was best......... [/QUOTE]
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Testing Loads? Help
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