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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Measuring to the lands
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<blockquote data-quote="davkrat" data-source="post: 1082550" data-attributes="member: 6452"><p>NOPE! Absolutely not. What I am saying is that the units of measurement on your calipers don't mean squat. If it's 3.025", 3.027", 6.3 cm or 1,927 widget widths.... Who cares? All that matters is the difference. If you measure your bullets to the lands at 1,927 widget widths and find through CBTO trials that loaded rounds at 1,922 widget widths (a jump of 5 widgets) is the most accurate than that's all the info you need for future set up of your reloading die with that bullet for that barrel measured by that particular caliper. The dummy round contacts the lands of your barrel while the caliper measures somewhere along the curve ahead of it. It should routinely and repetitively measure off the same point along that curve bullet to bullet of the same make/model. Others claim lot to lot differences but for a hunting gun I wouldn't be worried about being that picky. </p><p></p><p>In the end where you measure shouldn't matter as long as you are not measuring the tips which can be highly variable and easily damaged. That's the whole reason for the comparator rather than an OAL measurement with straight calipers. </p><p></p><p>It's all about the DELTA.</p></blockquote><p></p>
[QUOTE="davkrat, post: 1082550, member: 6452"] NOPE! Absolutely not. What I am saying is that the units of measurement on your calipers don't mean squat. If it's 3.025", 3.027", 6.3 cm or 1,927 widget widths.... Who cares? All that matters is the difference. If you measure your bullets to the lands at 1,927 widget widths and find through CBTO trials that loaded rounds at 1,922 widget widths (a jump of 5 widgets) is the most accurate than that's all the info you need for future set up of your reloading die with that bullet for that barrel measured by that particular caliper. The dummy round contacts the lands of your barrel while the caliper measures somewhere along the curve ahead of it. It should routinely and repetitively measure off the same point along that curve bullet to bullet of the same make/model. Others claim lot to lot differences but for a hunting gun I wouldn't be worried about being that picky. In the end where you measure shouldn't matter as long as you are not measuring the tips which can be highly variable and easily damaged. That's the whole reason for the comparator rather than an OAL measurement with straight calipers. It's all about the DELTA. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Measuring to the lands
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