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Long Range Hunting & Shooting
question on seating depth/ladder test
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<blockquote data-quote="dmax1800" data-source="post: 1666398" data-attributes="member: 68255"><p>I develop a load a little different. First I find whether my barrel likes slow powder, mid range powder or fast powder with the bullet I would like to use. For this, I use a powder charge about 60% of the way from the minimum charge to the maximum charge. I have found that seating depth does or can make quite a difference in final grouping. Bullets like Nosler, Sierra, Barnes and Hornady aren't near as finicky as Bergers. Barnes I start at 50 thou off the lands. The others I start at 20 off the lands and then work up the pounder charge. With Bergers, I do some groupings at several different seating depths and about 60% more than the minimum powder. </p><p></p><p>Along with doing a ladder test, I also do a velocity node test. Hopefully the two coincides. I have found that the velocity node is just as important as the ladder node, and sometimes more important. Then I play with seating depth.</p><p></p><p>In addition to the seating depth, consistent neck tension is also important, especially at 1000 yards or more. And sometimes 1 thou difference in neck tension can also effect group sizes.</p><p></p><p>I guess the proof is in the pudding. I've got a 300 WM that will shoot .5 MOA at 100 yards with a hunting bullet and a 6MM Creedmoor that right now is shooting .25 MOA at 100, but I'm not done with it yet. Hopefully I can get it into the high 1s.</p></blockquote><p></p>
[QUOTE="dmax1800, post: 1666398, member: 68255"] I develop a load a little different. First I find whether my barrel likes slow powder, mid range powder or fast powder with the bullet I would like to use. For this, I use a powder charge about 60% of the way from the minimum charge to the maximum charge. I have found that seating depth does or can make quite a difference in final grouping. Bullets like Nosler, Sierra, Barnes and Hornady aren't near as finicky as Bergers. Barnes I start at 50 thou off the lands. The others I start at 20 off the lands and then work up the pounder charge. With Bergers, I do some groupings at several different seating depths and about 60% more than the minimum powder. Along with doing a ladder test, I also do a velocity node test. Hopefully the two coincides. I have found that the velocity node is just as important as the ladder node, and sometimes more important. Then I play with seating depth. In addition to the seating depth, consistent neck tension is also important, especially at 1000 yards or more. And sometimes 1 thou difference in neck tension can also effect group sizes. I guess the proof is in the pudding. I've got a 300 WM that will shoot .5 MOA at 100 yards with a hunting bullet and a 6MM Creedmoor that right now is shooting .25 MOA at 100, but I'm not done with it yet. Hopefully I can get it into the high 1s. [/QUOTE]
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question on seating depth/ladder test
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