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Long Range Hunting & Shooting
question on seating depth/ladder test
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<blockquote data-quote="dougduey" data-source="post: 1666425" data-attributes="member: 33159"><p>Like Base424 stated, both will work. They all get you to the same place. I've tried them all, but load develop one way now.</p><p>First, I like to seat the bullet to the most concentric depth possible, which should be where the boat tail/base of the bullet junction is at the neck/shoulder junction of the brass case. If that won't fit in my mag box (all my rifles are for hunting), then I'll seat it to max length that fits in my mag. </p><p>Next, I load up charges based on published data, shoot them over my magnetto speed chronograph and find where max is. I look at my velocities to see where the velcoities flatten out, and mark those as velocity nodes. Typically there are 2 of these velocity nodes, and sometimes 3. I pick the one that is closest to max but not showing pressure signs. Then I'll drop down about a grain and work up in 0.2-0.3 gr increments and get a really good idea of where the middle of the velocity node is. Once I find the middle, I load up 5 rounds to shoot and see how it groups and another 5 to give me a good velocity representation. If the ES and SD are good, but the group isn't as tight as I want, I will then, play with seating depth. I usually go up and down 0.005" in seating depth to see where the bullet wants to be. Usually, that's as much adjustment that I usually need.</p><p>The 6.5 Guys have a great write up and video on their website.</p></blockquote><p></p>
[QUOTE="dougduey, post: 1666425, member: 33159"] Like Base424 stated, both will work. They all get you to the same place. I've tried them all, but load develop one way now. First, I like to seat the bullet to the most concentric depth possible, which should be where the boat tail/base of the bullet junction is at the neck/shoulder junction of the brass case. If that won't fit in my mag box (all my rifles are for hunting), then I'll seat it to max length that fits in my mag. Next, I load up charges based on published data, shoot them over my magnetto speed chronograph and find where max is. I look at my velocities to see where the velcoities flatten out, and mark those as velocity nodes. Typically there are 2 of these velocity nodes, and sometimes 3. I pick the one that is closest to max but not showing pressure signs. Then I'll drop down about a grain and work up in 0.2-0.3 gr increments and get a really good idea of where the middle of the velocity node is. Once I find the middle, I load up 5 rounds to shoot and see how it groups and another 5 to give me a good velocity representation. If the ES and SD are good, but the group isn't as tight as I want, I will then, play with seating depth. I usually go up and down 0.005" in seating depth to see where the bullet wants to be. Usually, that's as much adjustment that I usually need. The 6.5 Guys have a great write up and video on their website. [/QUOTE]
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question on seating depth/ladder test
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