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Rifles, Reloading, Optics, Equipment
Reloading
Digital Micrometer Problems
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<blockquote data-quote="dsculley" data-source="post: 1354716" data-attributes="member: 77514"><p>LDHunter, there are many makers of digital calipers that are good. You can spend from less than $20.00 to nearly $500.00. Amazon has a Neiko caliper that is accurate to 0.001" for $16.85. Most of the reloading supply manufacturers have one that is similar. If you are concerned about the precision of your caliper, have a piece of tool steel cut and hardened (needs to be hardened so it will not wear easily). Have it cut about the same length as your average cartridge length. This is your gauge. Measure it with your caliper. Record this measurement. Now you can check the repeatability (precision) of your caliper at any time, such as before each bullet seating session. Note: For this operation it is not important that your caliper is accurate, but it is important that your caliper is repeatable.</p><p></p><p>If it were me, before I bought a new caliper, I would make (or have made) the gauge mentioned above and test my current caliper.</p><p></p><p>A tip for using a mechanical dial caliper with old eyes: The Zero on the dial is usually easier to read than the rest of the number (at least to me it is). Take your first cartridge with a seated bullet and put it in the comparator. With this cartridge in the comparator, rotate the dial so that the pointer is on Zero. Now you can easily tell if your next measurements are above or below the zero. It may be difficult at first to resolve the lines to know how much above or below, but you will soon get a good feel for this.</p><p></p><p>FWIW</p></blockquote><p></p>
[QUOTE="dsculley, post: 1354716, member: 77514"] LDHunter, there are many makers of digital calipers that are good. You can spend from less than $20.00 to nearly $500.00. Amazon has a Neiko caliper that is accurate to 0.001" for $16.85. Most of the reloading supply manufacturers have one that is similar. If you are concerned about the precision of your caliper, have a piece of tool steel cut and hardened (needs to be hardened so it will not wear easily). Have it cut about the same length as your average cartridge length. This is your gauge. Measure it with your caliper. Record this measurement. Now you can check the repeatability (precision) of your caliper at any time, such as before each bullet seating session. Note: For this operation it is not important that your caliper is accurate, but it is important that your caliper is repeatable. If it were me, before I bought a new caliper, I would make (or have made) the gauge mentioned above and test my current caliper. A tip for using a mechanical dial caliper with old eyes: The Zero on the dial is usually easier to read than the rest of the number (at least to me it is). Take your first cartridge with a seated bullet and put it in the comparator. With this cartridge in the comparator, rotate the dial so that the pointer is on Zero. Now you can easily tell if your next measurements are above or below the zero. It may be difficult at first to resolve the lines to know how much above or below, but you will soon get a good feel for this. FWIW [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Digital Micrometer Problems
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