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Rifles, Reloading, Optics, Equipment
Reloading
Measuring Bullet Seating off the Lands
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<blockquote data-quote="joe4570" data-source="post: 392967" data-attributes="member: 24912"><p>Not necessarily, although I always work up loads with an OAL gauge and a comparator. The Stony Point (Hornady) gauge is inexpensive, reliable and easy to use. Of course the second COL check, as already pointed out in this thread, is making sure the cartridge also clears the magazine, feeds up the ramp and, hopefully, ejects as an assembled round. For me, use of the gauge is to assure consistent assembly and safe operation.</p><p> </p><p>One advantage the Hornady unit has over some of the home brewed OAL gauges that are based on slip fitting a bullet into a case neck is that measurement is controlled by a pushrod that passes through the case. So if the lands grab the bullet and pull it forward when extracting the gauge, this is corrected when the bullet heel is seated back against the pushrod when the measurement is taken.</p><p> </p><p>Bullets with extended ogives often make getting near the lands impossible as bore diameter is reached so far up from the bullet's nose, a cartridge assembled to 0.020" off the lands would be too long to cycle through the gun. When I load for the .300 UM I don't exceed 3.600" and finesse charge for accuracy. A 0.020" movement that results in a 500 psi shift in pressure can be duplicated with a 0.2 tenths grain change in powder charge with a similar impact on accuracy as would result from moving the bullet toward or away from the gun's lands. I know we all have our own theories to apply for maximum performance.</p><p> </p><p>Just a thought.</p></blockquote><p></p>
[QUOTE="joe4570, post: 392967, member: 24912"] Not necessarily, although I always work up loads with an OAL gauge and a comparator. The Stony Point (Hornady) gauge is inexpensive, reliable and easy to use. Of course the second COL check, as already pointed out in this thread, is making sure the cartridge also clears the magazine, feeds up the ramp and, hopefully, ejects as an assembled round. For me, use of the gauge is to assure consistent assembly and safe operation. One advantage the Hornady unit has over some of the home brewed OAL gauges that are based on slip fitting a bullet into a case neck is that measurement is controlled by a pushrod that passes through the case. So if the lands grab the bullet and pull it forward when extracting the gauge, this is corrected when the bullet heel is seated back against the pushrod when the measurement is taken. Bullets with extended ogives often make getting near the lands impossible as bore diameter is reached so far up from the bullet's nose, a cartridge assembled to 0.020" off the lands would be too long to cycle through the gun. When I load for the .300 UM I don't exceed 3.600" and finesse charge for accuracy. A 0.020" movement that results in a 500 psi shift in pressure can be duplicated with a 0.2 tenths grain change in powder charge with a similar impact on accuracy as would result from moving the bullet toward or away from the gun's lands. I know we all have our own theories to apply for maximum performance. Just a thought. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Measuring Bullet Seating off the Lands
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