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Rifles, Reloading, Optics, Equipment
Reloading
Seating depth test
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<blockquote data-quote="Mikecr" data-source="post: 2529655" data-attributes="member: 1521"><p>I drop below what I expect to be a mid node for barrel length.</p><p>Like if I strongly expect a mid node from 2950-3050 with a 28" barrel, I'll drop the charge to ~2875, and validate that my groups there (at any seating) suks. If during seating testing my groups close to ragged holes, I know the test is too close to a powder node, and that half my data suks. I need to back the powder away from it.</p><p></p><p>I want to see ~1 to 1/2moa and back grouping as I move seating in 10thou increments (to begin with).</p><p>You might also do primer swap testing with this poor load, while fireforming.</p><p>Then if I pick best coarse seating in that (even though it's not dead nutz best yet), and shoot a ladder, my pattern should not be an abstract, but an easy to see best powder rung.</p><p>Then after incremental validation of best powder node, go with that back to fine tweaking of seating (in it's window) (similar to that performed for this thread) -for tightest group shaping. If there is tighter to get still, adjust neck sizing length (neck tension) for it.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2529655, member: 1521"] I drop below what I expect to be a mid node for barrel length. Like if I strongly expect a mid node from 2950-3050 with a 28" barrel, I'll drop the charge to ~2875, and validate that my groups there (at any seating) suks. If during seating testing my groups close to ragged holes, I know the test is too close to a powder node, and that half my data suks. I need to back the powder away from it. I want to see ~1 to 1/2moa and back grouping as I move seating in 10thou increments (to begin with). You might also do primer swap testing with this poor load, while fireforming. Then if I pick best coarse seating in that (even though it's not dead nutz best yet), and shoot a ladder, my pattern should not be an abstract, but an easy to see best powder rung. Then after incremental validation of best powder node, go with that back to fine tweaking of seating (in it's window) (similar to that performed for this thread) -for tightest group shaping. If there is tighter to get still, adjust neck sizing length (neck tension) for it. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Seating depth test
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