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Rifles, Reloading, Optics, Equipment
Reloading
Why can't i reload exact cartridges?
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<blockquote data-quote="desertcrr1" data-source="post: 1574310" data-attributes="member: 92146"><p>The source of variance in well-made bullets is not from the base to the ogive, but from the ogive to the tip. The length to the tip makes little difference to the ballistics, but the length from base to ogive does. If your seater stem does not touch the bullet on or about the ogive and is touching more toward the tip, you will necessarily introduce the bullet length variance into the cartridge length variance. If you send your bullet and your seater stem to RCBS and they will fit it to work with the bullet. At the same time, seat the same bullet in the same case ten times and note the variance in your equipment and technique. Measure each bullet to the tip and to the ogive and note variance. See where it coming from. Just measure one cartridge base to ogive 10 or 20 times and note your measurement error. You need to learn about sources of variance before it's possible to reduce it systematically. Shoot 10 loads for group that have less than .001 ES and 10 that have more than .004. Find out what's important to you before you chase it down the hole much further.</p></blockquote><p></p>
[QUOTE="desertcrr1, post: 1574310, member: 92146"] The source of variance in well-made bullets is not from the base to the ogive, but from the ogive to the tip. The length to the tip makes little difference to the ballistics, but the length from base to ogive does. If your seater stem does not touch the bullet on or about the ogive and is touching more toward the tip, you will necessarily introduce the bullet length variance into the cartridge length variance. If you send your bullet and your seater stem to RCBS and they will fit it to work with the bullet. At the same time, seat the same bullet in the same case ten times and note the variance in your equipment and technique. Measure each bullet to the tip and to the ogive and note variance. See where it coming from. Just measure one cartridge base to ogive 10 or 20 times and note your measurement error. You need to learn about sources of variance before it's possible to reduce it systematically. Shoot 10 loads for group that have less than .001 ES and 10 that have more than .004. Find out what's important to you before you chase it down the hole much further. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Why can't i reload exact cartridges?
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