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Rifles, Reloading, Optics, Equipment
Reloading
OBT method, barrel length vs velocity
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<blockquote data-quote="Stammster" data-source="post: 1995414" data-attributes="member: 114381"><p>I have taken some interest in Chris Long's OBT method.</p><p></p><p>I have several guns in 270 Win, with different barrel lengths. With multiple calibrated Quickload runs, I found the required charge to give the recommended ideal OBT node(s). I did not vary powder, bullet, COAL, H2O capacity, etc.). Just barrel length.</p><p></p><p>I have come to the conclusion that the OBT nodes are independent of barrel length and a function of muzzle velocity only.</p><p></p><p>For example, 20", 22", and 24" all have separate ideal recommended optimum barrel times, but they all occur at the same muzzle velocity for a given "node".</p><p></p><p>Anyone else come to the same conclusion based on your data analysis? </p><p></p><p>By the way, I am not convinced that the OBT method is actually useful. In fact, I history matched multiple (>15) load developments (0.3 gr powder increments from min to max with 3-5 shot group size) shot over the last few years, and in a more than a few cases, the worst group size occurred at a charge weight/velocity that was supposed to be at the ideal OBT node. In other cases it was pretty close.</p></blockquote><p></p>
[QUOTE="Stammster, post: 1995414, member: 114381"] I have taken some interest in Chris Long’s OBT method. I have several guns in 270 Win, with different barrel lengths. With multiple calibrated Quickload runs, I found the required charge to give the recommended ideal OBT node(s). I did not vary powder, bullet, COAL, H2O capacity, etc.). Just barrel length. I have come to the conclusion that the OBT nodes are independent of barrel length and a function of muzzle velocity only. For example, 20”, 22”, and 24” all have separate ideal recommended optimum barrel times, but they all occur at the same muzzle velocity for a given “node”. Anyone else come to the same conclusion based on your data analysis? By the way, I am not convinced that the OBT method is actually useful. In fact, I history matched multiple (>15) load developments (0.3 gr powder increments from min to max with 3-5 shot group size) shot over the last few years, and in a more than a few cases, the worst group size occurred at a charge weight/velocity that was supposed to be at the ideal OBT node. In other cases it was pretty close. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
OBT method, barrel length vs velocity
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