Armory Sponsor
Posted: 3/22/2009 6:21:40 PM EDT
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Do any of you guys just load up a few rounds of each charge and just shoot them to get to pressure signs and then start your workup under the pressure signs? I feel like I'm wasting time and bullets just blasting up to the velocities I want and then tweaking it for accuracy.
Would this be a dangerous strategy to load up say 3 of each charge to find where I get pressure signs and then doing some workup after that? Polytech |
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I guess it depends on your powder increase increments.
Three rounds are fine to test for pressure signs as long as you are not jumping too far ahead in charge weights. Remember you can always pull rounds and reuse the components once you start to see pressure signs. What have you been doing up until now? Also don't forget that you can be using a chrono during these pressure tests to get an idea of what velocity you are seeing. Then when you can do a ladder test or whatever method you like for finidng the sweet spot and then test for accuracy. |
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Three round groups shot carefully with a wind indicator are enough to give a pretty good idea about which loads will tune.
But, to hurry things along, load one cartridge at each charge increment and shoot those until you get to the speed you want, or the results start looking scary. Then find the tuned load. Three shot groups are a good place to start because the tuned load will occur where the bullets fall onto each other over a range of powder charges; the groups will stop climbing on the target with increasing powder charge over a half grain increment or thereabouts. Once you think you've found this node, shoot to find the center of the range of charge weights that produce best accuracy. Note that this method means every group is shot at the same aiming point. |
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