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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Ladder Test Input
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<blockquote data-quote="highdrum" data-source="post: 1946564" data-attributes="member: 13732"><p>Do you have chrono data with the series of 10 shots? I feel you need to test your seating depth a bit more. I generally set all rounds 5k off lands. I take my press to the range with me. I usually shoot 2 shots @ 5k off, if bad, seat another 6k deeper and shoot 2 more, repeat. Once I find a good 2 shot group, 1 shoot the 3rd. If it's tight, I shoot 2 more groups +.003 and -.003 from the known good seating depth. Usually you can find a node 3-5k wide where it shoots tight groups with the same poi. Say it's 2.812-2.817 that shoots in your node. I'd seat @ 2.816 as you'll have 4k throat burn that'll stay in your window before accuracy falls off. Lots of people are shooting ladders with paired charges say: 84.5 x 2, 85 x 2, 85.5 x2 and so on. If the vo spread is large on the two shots of same charge it'll usually show on target with spreads. </p><p>Did you find pressure on the ladder? If so where and what was charge? Usually you can see that 1.5gr below psi will shoot well.</p></blockquote><p></p>
[QUOTE="highdrum, post: 1946564, member: 13732"] Do you have chrono data with the series of 10 shots? I feel you need to test your seating depth a bit more. I generally set all rounds 5k off lands. I take my press to the range with me. I usually shoot 2 shots @ 5k off, if bad, seat another 6k deeper and shoot 2 more, repeat. Once I find a good 2 shot group, 1 shoot the 3rd. If it's tight, I shoot 2 more groups +.003 and -.003 from the known good seating depth. Usually you can find a node 3-5k wide where it shoots tight groups with the same poi. Say it's 2.812-2.817 that shoots in your node. I'd seat @ 2.816 as you'll have 4k throat burn that'll stay in your window before accuracy falls off. Lots of people are shooting ladders with paired charges say: 84.5 x 2, 85 x 2, 85.5 x2 and so on. If the vo spread is large on the two shots of same charge it'll usually show on target with spreads. Did you find pressure on the ladder? If so where and what was charge? Usually you can see that 1.5gr below psi will shoot well. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Ladder Test Input
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