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Long Range Hunting & Shooting
338 Allen Xpress, RL33 load development
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<blockquote data-quote="Pdvdh" data-source="post: 1044334" data-attributes="member: 4191"><p>I've tracked MV temperature progression in my 300 Win Mag with IMR 7828, and 7mm Rem Mag with Retumbo, quite extensively in the past. The rate of progression wasn't very linear with Retumbo as the temperature became quite cold (-5* to 10*F). Based on those experiences, I know I need more data points with RL33 prior to reaching firm conclusions. </p><p></p><p>I only compile a lot of data on a specific load in multiple temperatures after I've developed and selected a long range load in my personal rifles. Then as I continue to test and shoot that load, more and more temperature data is accumulated, all with the same powder, primer, bullet, cartridge casings, seating depths, barrel, etc... As you've stated, there are so many variations and combinations of calibers, case capacities, components, seating depths, barrels, and loads that affect MV that there aren't many shooters that have both the equipment AND a sufficient number of shots with carefully controlled protocols/conditions/temperatures to reach valid conclusions. In warmer temps, waiting the time it takes to allow the barrel to return to ambient temperature is in itself tedious. Too much thumb twiddling for most shooters. It requires time and patience.</p><p></p><p>If RL33 yields a good accurate load that I choose for use, I'll eventually end up with quite a bit of MV data. If not, I'll only end up with data until I abandon RL33 load development efforts. I have unusually high confidence in my MV data because I get four velocities from three different chronographs for each shot fired (two velocities from the Oehler 35P). I identify and discard faulty velocity data, and confirm that velocity data I use is credible. I'll share my findings, whatever they be, but all my data will be from my specific rifle, cartridge, and load. My data is great and directly applicable in my rifle. Not so applicable to other's rifles/calibers/cartridges/barrels/bullets, etc...</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1044334, member: 4191"] I've tracked MV temperature progression in my 300 Win Mag with IMR 7828, and 7mm Rem Mag with Retumbo, quite extensively in the past. The rate of progression wasn't very linear with Retumbo as the temperature became quite cold (-5* to 10*F). Based on those experiences, I know I need more data points with RL33 prior to reaching firm conclusions. I only compile a lot of data on a specific load in multiple temperatures after I've developed and selected a long range load in my personal rifles. Then as I continue to test and shoot that load, more and more temperature data is accumulated, all with the same powder, primer, bullet, cartridge casings, seating depths, barrel, etc... As you've stated, there are so many variations and combinations of calibers, case capacities, components, seating depths, barrels, and loads that affect MV that there aren't many shooters that have both the equipment AND a sufficient number of shots with carefully controlled protocols/conditions/temperatures to reach valid conclusions. In warmer temps, waiting the time it takes to allow the barrel to return to ambient temperature is in itself tedious. Too much thumb twiddling for most shooters. It requires time and patience. If RL33 yields a good accurate load that I choose for use, I'll eventually end up with quite a bit of MV data. If not, I'll only end up with data until I abandon RL33 load development efforts. I have unusually high confidence in my MV data because I get four velocities from three different chronographs for each shot fired (two velocities from the Oehler 35P). I identify and discard faulty velocity data, and confirm that velocity data I use is credible. I'll share my findings, whatever they be, but all my data will be from my specific rifle, cartridge, and load. My data is great and directly applicable in my rifle. Not so applicable to other's rifles/calibers/cartridges/barrels/bullets, etc... [/QUOTE]
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