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Rifles, Reloading, Optics, Equipment
Reloading
Accuracy due to velocity, charge, or random...?
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<blockquote data-quote="MNbogboy" data-source="post: 1589526" data-attributes="member: 18849"><p>To the OP. After 50+ years of rolling my own I have to admit I am still learning. Your original questions are valid and yes I can see and have been through your frustrations. Yes there are nodes, yes they are pretty easy to find, but everything has to be controlled & verified to find them.</p><p>A good chronograph is important but with long range ladders not a necessity. But the chronos can help verify the good, bad and ugly. Good meaning a magneto speed or labradar. An optical if setup right in optimal light conditions will also work. I used shooting chronies for years and learned when and when not they are useful.</p><p>As others said quality of test loads is the most important.</p><p>Equipment obviously has to be in its best mechanical condition (ie; action bedding & torque, scope bases & rings etc.)</p><p>Shooter & bench systems also proper repeatable form.</p><p>That being said start with your best load so far and do a complete seating test from .010 off the lands down to say .120 off using 3 shot groups in .010 increments. Shoot these round robin in a fouled barrel. Don't let the barrel get hot. Then run a second test starting at .015 off to say .125 off again in .010 increments, also round robin. Most likely you will see 2 or more seating nodes with each test. Pay attention to the smallest groups and their point of impact in relation to the others (No scope adjustments during these tests).</p><p>After seating tests the OCW or ladder test can commence for velocity. Start again with your "good" load and load say 5 or 6 in each direction at .2 or .3 grain increments. Shooting the 10 or 12 now at a longer distance ladder (300-400) will show possible velocity nodes by verticle impact also chrono readings will verify the node. I've always recorded velocities but lately been graphing results. Nodes are clearly visible on graphs not necessary but really tell you where you are at. Once you identify the node or nodes you are almost there. Now you can fine tune your seating in .003" increments both directions. As you leave the seating node your groups open.</p><p>This whole thread has provided a ton of great advice and we hope we have helped.</p><p>Good luck and keep us posted,</p><p>Randy</p></blockquote><p></p>
[QUOTE="MNbogboy, post: 1589526, member: 18849"] To the OP. After 50+ years of rolling my own I have to admit I am still learning. Your original questions are valid and yes I can see and have been through your frustrations. Yes there are nodes, yes they are pretty easy to find, but everything has to be controlled & verified to find them. A good chronograph is important but with long range ladders not a necessity. But the chronos can help verify the good, bad and ugly. Good meaning a magneto speed or labradar. An optical if setup right in optimal light conditions will also work. I used shooting chronies for years and learned when and when not they are useful. As others said quality of test loads is the most important. Equipment obviously has to be in its best mechanical condition (ie; action bedding & torque, scope bases & rings etc.) Shooter & bench systems also proper repeatable form. That being said start with your best load so far and do a complete seating test from .010 off the lands down to say .120 off using 3 shot groups in .010 increments. Shoot these round robin in a fouled barrel. Don't let the barrel get hot. Then run a second test starting at .015 off to say .125 off again in .010 increments, also round robin. Most likely you will see 2 or more seating nodes with each test. Pay attention to the smallest groups and their point of impact in relation to the others (No scope adjustments during these tests). After seating tests the OCW or ladder test can commence for velocity. Start again with your "good" load and load say 5 or 6 in each direction at .2 or .3 grain increments. Shooting the 10 or 12 now at a longer distance ladder (300-400) will show possible velocity nodes by verticle impact also chrono readings will verify the node. I've always recorded velocities but lately been graphing results. Nodes are clearly visible on graphs not necessary but really tell you where you are at. Once you identify the node or nodes you are almost there. Now you can fine tune your seating in .003" increments both directions. As you leave the seating node your groups open. This whole thread has provided a ton of great advice and we hope we have helped. Good luck and keep us posted, Randy [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Accuracy due to velocity, charge, or random...?
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