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Tennessee Gun Owners Forums
Reloading
Why are velocity nodes so important?
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<blockquote data-quote="jlanecr500" data-source="post: 5105162" data-attributes="member: 16430"><p>Typically, I calculate close enough to the node so as to start out with a decent group. Sometimes things don't go as planned and some powders don't work out either because they foul heavily making loading more difficult, etc.</p><p></p><p>Some do ladder tests and others do OCW progressions. Either way, at .2gr increments, I would go thru a lot of $2 bullets spanning the gap from 74gr to 86gr of powder in a ladder or OCW test. Calculating the load in Quick Load and targeting specific barrel times, I am able to get within a grain or 2 of the sweet spot. Unlike common cartridges, that have book loads which only need tweaking in your gun, we are shooting loads that have never been fired before so we're in uncharted territory. I understand that this doesn't mean much to some people but in this case it is a vehicle to demonstrate proven concepts and theories. This in no way replaces shooting ladders or progressions but it will get you close and demonstrate why nodes are so important. I know it isn't real clear as I really haven't gotten in deep enough but I will. I found this target pic from that same test day. It is 250gr bullets but doesn't have charges listed. We didn't shoot any large groups that day as I was able to calculate close to the nodes. Notice the velocities that are similar to the other targets with different weight bullets. Barrel time is a big part of accuracy.[ATTACH=full]73321[/ATTACH]</p></blockquote><p></p>
[QUOTE="jlanecr500, post: 5105162, member: 16430"] Typically, I calculate close enough to the node so as to start out with a decent group. Sometimes things don't go as planned and some powders don't work out either because they foul heavily making loading more difficult, etc. Some do ladder tests and others do OCW progressions. Either way, at .2gr increments, I would go thru a lot of $2 bullets spanning the gap from 74gr to 86gr of powder in a ladder or OCW test. Calculating the load in Quick Load and targeting specific barrel times, I am able to get within a grain or 2 of the sweet spot. Unlike common cartridges, that have book loads which only need tweaking in your gun, we are shooting loads that have never been fired before so we're in uncharted territory. I understand that this doesn't mean much to some people but in this case it is a vehicle to demonstrate proven concepts and theories. This in no way replaces shooting ladders or progressions but it will get you close and demonstrate why nodes are so important. I know it isn't real clear as I really haven't gotten in deep enough but I will. I found this target pic from that same test day. It is 250gr bullets but doesn't have charges listed. We didn't shoot any large groups that day as I was able to calculate close to the nodes. Notice the velocities that are similar to the other targets with different weight bullets. Barrel time is a big part of accuracy.[ATTACH type="full" alt="20180111_121025.jpg"]73321[/ATTACH] [/QUOTE]
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Tennessee Gun Owners Forums
Reloading
Why are velocity nodes so important?
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