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Rifles, Reloading, Optics, Equipment
Reloading
Quick load work-up methods?
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<blockquote data-quote="benchracer" data-source="post: 1372163" data-attributes="member: 22069"><p>I believe the OBT (Optimum Barrel Time) method will get you where you want to go in the fewest shots.</p><p></p><p>The following assumes that you have already completed barrel break-in and that you are using once fired brass from your rifle.</p><p></p><p>First off, given your stated goal, I would consider seating depth testing to be optional. Whether or not you tune seating depth, and how you tune it, can be highly situational. Start by measuring distance to the lands with your chosen bullet, pick a starting place, and go with it.</p><p></p><p>Measure the actual water capacity of your fired cases and enter that data in QL, along with your barrel length and chosen COAL. Run your hypothetical and choose your powder. Now run your load table for your chosen powder. Choose a STARTING load, cross referencing with published data if at all possible. Load 3 rounds and fire them across a chronograph to obtain an average mv for that powder charge.</p><p></p><p>The more advanced QL users will then adjust the powder burn rate until the predicted muzzle velocity matches the actual muzzle velocity for the powder charge you tested. I don't adjust powder burn rate. I simply note the difference between predicted and actual powder charge at my recorded muzzle velocity and apply that correction to all subsequent powder charges. That reliably gets me in the ballpark.</p><p></p><p>Now that you have corrected powder charges in hand, you may wish to perform a short MIN-MAX runup to confirm that your MAX is where QL says it is.</p><p></p><p>Having established MAX powder charge in your rifle, refer to the barrel time data generated by QL in your load table. Cross reference that data with the predicted OBT nodes in the attached document. Choose a powder charge that puts you in the center of the highest predicted node that falls below your established MAX. Load your three or five shot test group and shoot it. If desired, load a test group a few tenths above and a few tenths below your chosen charge and shoot them, as well.</p><p></p><p>Your final group(s) should be near or below MOA. If they are not, the potential probably isn't there with your chosen combo.</p></blockquote><p></p>
[QUOTE="benchracer, post: 1372163, member: 22069"] I believe the OBT (Optimum Barrel Time) method will get you where you want to go in the fewest shots. The following assumes that you have already completed barrel break-in and that you are using once fired brass from your rifle. First off, given your stated goal, I would consider seating depth testing to be optional. Whether or not you tune seating depth, and how you tune it, can be highly situational. Start by measuring distance to the lands with your chosen bullet, pick a starting place, and go with it. Measure the actual water capacity of your fired cases and enter that data in QL, along with your barrel length and chosen COAL. Run your hypothetical and choose your powder. Now run your load table for your chosen powder. Choose a STARTING load, cross referencing with published data if at all possible. Load 3 rounds and fire them across a chronograph to obtain an average mv for that powder charge. The more advanced QL users will then adjust the powder burn rate until the predicted muzzle velocity matches the actual muzzle velocity for the powder charge you tested. I don't adjust powder burn rate. I simply note the difference between predicted and actual powder charge at my recorded muzzle velocity and apply that correction to all subsequent powder charges. That reliably gets me in the ballpark. Now that you have corrected powder charges in hand, you may wish to perform a short MIN-MAX runup to confirm that your MAX is where QL says it is. Having established MAX powder charge in your rifle, refer to the barrel time data generated by QL in your load table. Cross reference that data with the predicted OBT nodes in the attached document. Choose a powder charge that puts you in the center of the highest predicted node that falls below your established MAX. Load your three or five shot test group and shoot it. If desired, load a test group a few tenths above and a few tenths below your chosen charge and shoot them, as well. Your final group(s) should be near or below MOA. If they are not, the potential probably isn't there with your chosen combo. [/QUOTE]
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Quick load work-up methods?
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