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Rifles, Reloading, Optics, Equipment
Reloading
First time trying something like the ladder test
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<blockquote data-quote="RegionRat" data-source="post: 1555077" data-attributes="member: 57231"><p>Well, if the note about the difficult extraction on load 7 was a fluke and load 8, 9, didn't stick, combined with no visible signs of pressure on the primer or case, it makes me wonder if you shouldn't try one to two more runs of the same test from load 2 though 9 to see if the results are repeatable before you stop and do detailed group tests at any one load for seating depth.</p><p></p><p>For my own rigs, I run ladders more than once, and I round robin the shots to make sure bbl heating or fouling isn't adding bias.</p><p>I then plot all the verticals against charge weight on one plot, and again with velocity against charge weight on another. We look for nodes that help us decide where a OCW is likely to give us the most forgiveness for vertical and speed. The hope is groups at that charge weight can then be optimized by playing seating depth.</p><p></p><p>If the client is keeping his shots within say 500 yards for terminal ballistics performance, it looks like you should have enough muzzle velocity for a good all around rifle.</p><p></p><p>I run that ladder twice each time, and again, on two separate days, I do this to see how repeatable the results are between those four runs before I select a charge range for group testing. By the time I am done, I have a fair idea of how the cold bore performance will look and the brass is all detailed. The next tests I run are for big swings in climate. So far, using powders like H4350 that are known to be less temperature sensitive, I have been very happy with the efforts. YMMV</p></blockquote><p></p>
[QUOTE="RegionRat, post: 1555077, member: 57231"] Well, if the note about the difficult extraction on load 7 was a fluke and load 8, 9, didn't stick, combined with no visible signs of pressure on the primer or case, it makes me wonder if you shouldn't try one to two more runs of the same test from load 2 though 9 to see if the results are repeatable before you stop and do detailed group tests at any one load for seating depth. For my own rigs, I run ladders more than once, and I round robin the shots to make sure bbl heating or fouling isn't adding bias. I then plot all the verticals against charge weight on one plot, and again with velocity against charge weight on another. We look for nodes that help us decide where a OCW is likely to give us the most forgiveness for vertical and speed. The hope is groups at that charge weight can then be optimized by playing seating depth. If the client is keeping his shots within say 500 yards for terminal ballistics performance, it looks like you should have enough muzzle velocity for a good all around rifle. I run that ladder twice each time, and again, on two separate days, I do this to see how repeatable the results are between those four runs before I select a charge range for group testing. By the time I am done, I have a fair idea of how the cold bore performance will look and the brass is all detailed. The next tests I run are for big swings in climate. So far, using powders like H4350 that are known to be less temperature sensitive, I have been very happy with the efforts. YMMV [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
First time trying something like the ladder test
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