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Rifles, Reloading, Optics, Equipment
Reloading
Concentricity gauge
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<blockquote data-quote="Bart B" data-source="post: 339908" data-attributes="member: 5302"><p>Depending on the gage and how its used, a given cartridge will produce different numbers. I found this out checking several out one day.</p><p></p><p>I made my own gage that rests the bullet 1/4 inch up from the head and at midpoint on the shoulder. The dial indicator's tip touches the bullet about 1/10th inch back from the tip.</p><p></p><p>Best example of what 3 to 4 thousandths of bullet runout measured as above will do happened some years ago. Several thousand rounds of .308 ammo loaded on two Dillon 1050's had their powder charges metered to 3/10ths grain into primed, new Winchester cases. 20 random rounds were tested at 600 yards in one session, group was 2.7 inches. From a standard SAAMI chamber. A couple dozen top shooters from around the world agreed it shot about 1/2 MOA at 600 yards from their rifles.</p></blockquote><p></p>
[QUOTE="Bart B, post: 339908, member: 5302"] Depending on the gage and how its used, a given cartridge will produce different numbers. I found this out checking several out one day. I made my own gage that rests the bullet 1/4 inch up from the head and at midpoint on the shoulder. The dial indicator's tip touches the bullet about 1/10th inch back from the tip. Best example of what 3 to 4 thousandths of bullet runout measured as above will do happened some years ago. Several thousand rounds of .308 ammo loaded on two Dillon 1050's had their powder charges metered to 3/10ths grain into primed, new Winchester cases. 20 random rounds were tested at 600 yards in one session, group was 2.7 inches. From a standard SAAMI chamber. A couple dozen top shooters from around the world agreed it shot about 1/2 MOA at 600 yards from their rifles. [/QUOTE]
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Concentricity gauge
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