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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: 1044261" data-attributes="member: 4191"><p>Thanks for the additional information Greg. Appreciate that.</p><p></p><p>Yes, I just recently have begun testing RL33 for temperature sensitivity. I run three separate light sensing chronographs concurrently. An Oehler 35P, an Oehler 33, and a PACT PC2. All skyscreens are mounted on a single rigid aluminum skyscreen rail. I employ 6' skyscreen spacings for all three chronographs in order to improve accuracy. When I get consistent velocities across all three chronographs for each bullet fired, I know I'm getting accurate and valid velocity data.</p><p></p><p>I've only begun collecting data within the past week. Cartridge is a 30/375 S.I. It's the 375 Ruger case wildcatted to .308 caliber by Rich Sherman - username (<strong>elkaholic</strong>). Case capacity is similar to 300 Weatherby. My data is pretty limited at this time, as I've just begun barrel break in and load development.</p><p></p><p>I've only recorded 4 shots so far. 88.5gr RL33, Federal GM215Ms, behind 215gr .308 Berger Hybrids. Bullets jammed hard into the lands. Two bullets were fired in 9*F outdoor ambient temps (both rifle and ammo exposed to 9*F for 90 minutes prior to shooting). Two bullets recorded as described above, rifle and ammo at 70*F shot over chronographs in 30*F outdoor ambient temps. Velocity data was very comparable/consistent for the two shots fired at both temperatures. In other words, confidence in MV is high. </p><p></p><p>3021fps Avg MV @ 70*F</p><p>3002fps Avg MV @_ 9*F</p><p>MV progression rate with increasing temperature = 0.31 fps/*F</p><p></p><p>I hadn't posted my data on this Forum yet because my data pool is so limited. I'll be collecting more data over time in additional outdoor temperatures as I continue with load development. More data will, of course, create a more confident MV/Temperature relationship.</p><p>Paul</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1044261, member: 4191"] Thanks for the additional information Greg. Appreciate that. Yes, I just recently have begun testing RL33 for temperature sensitivity. I run three separate light sensing chronographs concurrently. An Oehler 35P, an Oehler 33, and a PACT PC2. All skyscreens are mounted on a single rigid aluminum skyscreen rail. I employ 6' skyscreen spacings for all three chronographs in order to improve accuracy. When I get consistent velocities across all three chronographs for each bullet fired, I know I'm getting accurate and valid velocity data. I've only begun collecting data within the past week. Cartridge is a 30/375 S.I. It's the 375 Ruger case wildcatted to .308 caliber by Rich Sherman - username ([B]elkaholic[/B]). Case capacity is similar to 300 Weatherby. My data is pretty limited at this time, as I've just begun barrel break in and load development. I've only recorded 4 shots so far. 88.5gr RL33, Federal GM215Ms, behind 215gr .308 Berger Hybrids. Bullets jammed hard into the lands. Two bullets were fired in 9*F outdoor ambient temps (both rifle and ammo exposed to 9*F for 90 minutes prior to shooting). Two bullets recorded as described above, rifle and ammo at 70*F shot over chronographs in 30*F outdoor ambient temps. Velocity data was very comparable/consistent for the two shots fired at both temperatures. In other words, confidence in MV is high. 3021fps Avg MV @ 70*F 3002fps Avg MV @_ 9*F MV progression rate with increasing temperature = 0.31 fps/*F I hadn't posted my data on this Forum yet because my data pool is so limited. I'll be collecting more data over time in additional outdoor temperatures as I continue with load development. More data will, of course, create a more confident MV/Temperature relationship. Paul [/QUOTE]
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338 Allen Xpress, RL33 load development
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