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Rifles, Reloading, Optics, Equipment
Reloading
Questions on weighing, measuring, sorting bullets
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<blockquote data-quote="Bart B" data-source="post: 369279" data-attributes="member: 5302"><p>I've shot 30 caliber Sierra Match Kings into 1/2 MOA at 800 yards and 5/8 MOA at 1000 yards testing loads with 15 to 20 shot groups. Those bullets have a 3/10ths grain weight spread, about 9 different ogive shapes (as seen on an optical comparitor) and vary in length by several thousandths of an inch. Checking them for out of round at the heel, they do vary about 1/10,000th or a bit more from being perfectly round. They're fine for me. All those tolerances are normal; Sierra doesn't mind a bit as their good match bullets would shoot into 1/4 MOA at 200 yards. Bullets get upset a bit as they slam into the rifling then get squeezed down going into rifled barrels with groove diameters a bit smaller than they are which is best for accuracy; that's gonna change their physical dimensions.</p><p></p><p>All the perfection one can sort bullets by using static measurements is a waste of time as far as I'm concerned. I think the best way to test bullets is to spin them at 30 to 40 thousand RPM and use the ones that don't wobble; those that spin true without any wobble will shoot very tiny groups at most any range.</p><p></p><p>A friend spun several hundred Lapua 30 caliber match bullets in a collet chucked in a Dremel Moto Tool. An amp meter was connected in line with its power cord. Bullets that were a bit unbalanced at 30 thousand RPM loaded the tool's bearings more with centrifugal force so more current was needed to spin the motor up to speed; minimum current meant perfect bullet balance. About a third of those bullet spun perfectly. A few were so out of balance they flew out of the collet bouncing off the ceiling and walls in the room.</p><p></p><p>Those dynamically tested bullets were loaded in full length sized cases and shot in match rifle whose barrel had a standard SAAMI chamber. Several 10-shot groups were shot at 600 yards. Groups ranged from 1.5 inches down to about .7 inch. Those bullets had about the same static measurements for weight, diameter, length and ogive as the Sierras I measured had. Bullets with average wobble/unbalance shot about 4 to 5 inches at 600.</p></blockquote><p></p>
[QUOTE="Bart B, post: 369279, member: 5302"] I've shot 30 caliber Sierra Match Kings into 1/2 MOA at 800 yards and 5/8 MOA at 1000 yards testing loads with 15 to 20 shot groups. Those bullets have a 3/10ths grain weight spread, about 9 different ogive shapes (as seen on an optical comparitor) and vary in length by several thousandths of an inch. Checking them for out of round at the heel, they do vary about 1/10,000th or a bit more from being perfectly round. They're fine for me. All those tolerances are normal; Sierra doesn't mind a bit as their good match bullets would shoot into 1/4 MOA at 200 yards. Bullets get upset a bit as they slam into the rifling then get squeezed down going into rifled barrels with groove diameters a bit smaller than they are which is best for accuracy; that's gonna change their physical dimensions. All the perfection one can sort bullets by using static measurements is a waste of time as far as I'm concerned. I think the best way to test bullets is to spin them at 30 to 40 thousand RPM and use the ones that don't wobble; those that spin true without any wobble will shoot very tiny groups at most any range. A friend spun several hundred Lapua 30 caliber match bullets in a collet chucked in a Dremel Moto Tool. An amp meter was connected in line with its power cord. Bullets that were a bit unbalanced at 30 thousand RPM loaded the tool's bearings more with centrifugal force so more current was needed to spin the motor up to speed; minimum current meant perfect bullet balance. About a third of those bullet spun perfectly. A few were so out of balance they flew out of the collet bouncing off the ceiling and walls in the room. Those dynamically tested bullets were loaded in full length sized cases and shot in match rifle whose barrel had a standard SAAMI chamber. Several 10-shot groups were shot at 600 yards. Groups ranged from 1.5 inches down to about .7 inch. Those bullets had about the same static measurements for weight, diameter, length and ogive as the Sierras I measured had. Bullets with average wobble/unbalance shot about 4 to 5 inches at 600. [/QUOTE]
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