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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: 1999174" data-attributes="member: 114381"><p>Thanks.</p><p>Questions to ponder</p><p>1.). So why the bad group so close to the ideal?</p><p>2.). 3050 fps +/- 10 fps seems to be the recommended "ideal" OBT based muzzle velocity for this node. My original argument / question was around this being the same for multiple barrel lengths. So why not just simplify it to that. Let people strap on a chronograph and aim for a charge weight that gets them there.</p><p></p><p>Why not simply just give the following:</p><p>Node 4: 3270fps</p><p>Node 5: 3060fps</p><p>Node 6: 2930 fps</p><p>Etc.</p><p>Am I trying to oversimplify things? Perhaps, but IMO so are OBT times...but in reality it's just appears to boil down to the best velocity to target - essentially independent of barrel length. So no need to even involve time - as it seems to cancel out.</p><p></p><p>I'm also going to make some runs with other calibers and bullets weights to see if this crosses over to other calibers. Initially my 25-06 data is showing it's pretty close with node 2 at 3790 fps and node 3 at 3390-3460 fps and node 4 at 3220-3270 fps, with 85-100 gr bullets.</p></blockquote><p></p>
[QUOTE="Stammster, post: 1999174, member: 114381"] Thanks. Questions to ponder 1.). So why the bad group so close to the ideal? 2.). 3050 fps +/- 10 fps seems to be the recommended “ideal” OBT based muzzle velocity for this node. My original argument / question was around this being the same for multiple barrel lengths. So why not just simplify it to that. Let people strap on a chronograph and aim for a charge weight that gets them there. Why not simply just give the following: Node 4: 3270fps Node 5: 3060fps Node 6: 2930 fps Etc. Am I trying to oversimplify things? Perhaps, but IMO so are OBT times...but in reality it’s just appears to boil down to the best velocity to target - essentially independent of barrel length. So no need to even involve time - as it seems to cancel out. I’m also going to make some runs with other calibers and bullets weights to see if this crosses over to other calibers. Initially my 25-06 data is showing it’s pretty close with node 2 at 3790 fps and node 3 at 3390-3460 fps and node 4 at 3220-3270 fps, with 85-100 gr bullets. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
OBT method, barrel length vs velocity
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