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Long Range Hunting & Shooting
338 Allen Xpress, RL33 load development
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<blockquote data-quote="AZShooter" data-source="post: 847192" data-attributes="member: 5219"><p>Thanks for the information Kirby. This confirms the data I gathered over a year ago with smaller cartridges. RL-33 with its longer burning curve yielded higher velocities than max loads of RL-25 or Retumbo.</p><p></p><p>The 6mm-284:</p><p>58 gr of Retumbo, 105 Berger target hybrid seated .065" off rifling vel 3307 fps</p><p>64 gr of RL-33 same data for bullet........................................... vel 3485 fps</p><p></p><p>257 Weatherby:</p><p> moly coated 110 accubond, .015" off rifling.</p><p></p><p>Original load 75.5 gr of RL-25 vel 3615 fps</p><p>84.5 gr of RL-33 vel 3735 fps </p><p></p><p></p><p></p><p>I have no earlier powder comparison for 300 RUM but did get good results in both accuracy and velocity.</p><p></p><p>I wanted to shoot the 230 berger match target hybrid but current barrel didn't have correct twist. I rechambered a 24" ss rem takeoff and worked up to 102 gr of RL-33 which showed the beginnings of pressure. Dropped to 100 gr for velocity of 2975 fps. Not bad for such a short barrel. </p><p></p><p>Keep up the testing. Many of us are interested. </p><p></p><p>Ross</p></blockquote><p></p>
[QUOTE="AZShooter, post: 847192, member: 5219"] Thanks for the information Kirby. This confirms the data I gathered over a year ago with smaller cartridges. RL-33 with its longer burning curve yielded higher velocities than max loads of RL-25 or Retumbo. The 6mm-284: 58 gr of Retumbo, 105 Berger target hybrid seated .065" off rifling vel 3307 fps 64 gr of RL-33 same data for bullet........................................... vel 3485 fps 257 Weatherby: moly coated 110 accubond, .015" off rifling. Original load 75.5 gr of RL-25 vel 3615 fps 84.5 gr of RL-33 vel 3735 fps I have no earlier powder comparison for 300 RUM but did get good results in both accuracy and velocity. I wanted to shoot the 230 berger match target hybrid but current barrel didn't have correct twist. I rechambered a 24" ss rem takeoff and worked up to 102 gr of RL-33 which showed the beginnings of pressure. Dropped to 100 gr for velocity of 2975 fps. Not bad for such a short barrel. Keep up the testing. Many of us are interested. Ross [/QUOTE]
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338 Allen Xpress, RL33 load development
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