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Rifles, Reloading, Optics, Equipment
Reloading
Need some advice
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<blockquote data-quote="nheninge" data-source="post: 270949" data-attributes="member: 13085"><p>Tight necks produce smaller groups...period. BUT they are more finicky. However, it is not JUST the neck that produces a tighter group, but likely a combination of custom barrel with tighter tolerances throughout the barrel and the gun. I still say that if I cut an inch off my factory savage barrel, re-chambered it with a tight neck, accuracy would still not be what I would require, so clearly other factors are at work than just the neck. Not that I would do this but...</p><p></p><p><em>a standard SAMI spec chamber could possibly be on the tight side</em>...</p><p>- Not sure I understand where you got this idea? SAMI is SAMI meaning "standardized" Factory rifles have to be standardized so Joe Smith can buy ammo from Winchester, remington etc safely. </p><p></p><p>Neck turning to take off a thou for a factory neck is fine with al least some improvement in accuracy likely d/t uniform neck tension on bullet release. Taking the brass to 0.012 is actually overworking the brass (work hardening) as it expands in a factory neck and even possibly prevents a proper gas seal around the neck. Not a good idea for a factory rifle.</p><p></p><p>Sorting by neck variance (cull cases w/ > 0.0015 variance) followed by neck turning to a uniform neck thickness is fast and easy (with the right tools) and will will most certainly outshoot ammo that has had no modifications because it is lined up with the rifling almost perfectly. A bullet with a thin side (common in win brass) means that bullet is than much off center with respect to the rifling. This runout can be negated by putting your bullet at or into the lands to some degree, but maybe not a good idea for a hunting rifle either.</p><p></p><p>click on the "insert image" button on the toolbar above where you reply to each thread. It has a small icon with a mountain on it?</p></blockquote><p></p>
[QUOTE="nheninge, post: 270949, member: 13085"] Tight necks produce smaller groups...period. BUT they are more finicky. However, it is not JUST the neck that produces a tighter group, but likely a combination of custom barrel with tighter tolerances throughout the barrel and the gun. I still say that if I cut an inch off my factory savage barrel, re-chambered it with a tight neck, accuracy would still not be what I would require, so clearly other factors are at work than just the neck. Not that I would do this but... [I]a standard SAMI spec chamber could possibly be on the tight side[/I]... - Not sure I understand where you got this idea? SAMI is SAMI meaning "standardized" Factory rifles have to be standardized so Joe Smith can buy ammo from Winchester, remington etc safely. Neck turning to take off a thou for a factory neck is fine with al least some improvement in accuracy likely d/t uniform neck tension on bullet release. Taking the brass to 0.012 is actually overworking the brass (work hardening) as it expands in a factory neck and even possibly prevents a proper gas seal around the neck. Not a good idea for a factory rifle. Sorting by neck variance (cull cases w/ > 0.0015 variance) followed by neck turning to a uniform neck thickness is fast and easy (with the right tools) and will will most certainly outshoot ammo that has had no modifications because it is lined up with the rifling almost perfectly. A bullet with a thin side (common in win brass) means that bullet is than much off center with respect to the rifling. This runout can be negated by putting your bullet at or into the lands to some degree, but maybe not a good idea for a hunting rifle either. click on the "insert image" button on the toolbar above where you reply to each thread. It has a small icon with a mountain on it? [/QUOTE]
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