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338 Allen Xpress, RL33 load development
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<blockquote data-quote="NZ Longranger" data-source="post: 1044199" data-attributes="member: 14"><p>[FONT=&quot]Jon,</p><p>We have just gone to huge lengths to land a large shipment of Re33, and yet we have Retumbo, H1000 and N570 in stock already, so that tells you our thoughts, but then you already knew them![/FONT]</p><p> [FONT=&quot]</p><p>Here are the proven facts across our Oehler 43 Ballistic Lab.[/FONT]</p><p> [FONT=&quot]</p><p>Re 33 produces more velocity for pressure than N570 or Retumbo, see this comparison in our 28" barrelled 338FX (338 Lapua improved) all loaded to the same 65,000psi pressure:[/FONT]</p><p> [FONT=&quot]Re33 - 250gn 3290fps, 300gn 2980fps. [/FONT][FONT=&quot][/FONT]</p><p> [FONT=&quot]N570 – 250gn 3270fps, 300gn 2965fps. [/FONT][FONT=&quot][/FONT]</p><p> [FONT=&quot]Retumbo/2225 – 300gn 2930fps.[/FONT][FONT=&quot][/FONT]</p><p> [FONT=&quot]OBP716 – 250gn 3325fps, 300gn 2990fps.[/FONT][FONT=&quot][/FONT]</p><p> [FONT=&quot]US869 – 300gn 2980fps.[/FONT][FONT=&quot][/FONT]</p><p> [FONT=&quot]Re25 – 300gn 2920fps. </p><p>[/FONT]</p><p></p><p>[FONT=&quot][/FONT][FONT=&quot][/FONT]</p><p> There is a small gain 10 to 20fps over N570, but a much larger 50fps gain over Retumbo. It will <strong>not</strong> produce 150fps more than Retumbo in an Edge for the same pressure. Again, about 50 to 60 fps increase. </p><p></p><p></p><p></p><p> In our rifles it has proved to be significantly more accurate than N570.</p><p></p><p></p><p> It fills the case up more nicely than N570.</p><p></p><p></p><p> The above are facts, although the accuracy may differ in other rifles.</p><p> Now we come to the not so definites.</p><p></p><p></p><p> Temperature sensitivity wise, it definitely exhibits more than Retumbo and N570, but it hasn't been significant enough that we can't work with it at our possibly less extreme temps. From 32F to 82F we can live with it, using the powder temp feature on Shooter or AB to allow for it. Barrel temp seems to be as important as powder temp, so we use a fudge factor to incorporate noth.</p><p> </p><p></p><p>N570 has exhibited some funny temp/pressure spike issues of its own below 40F for us, but is more stable velocity wise through the usual 40F to 75F temps.</p><p> </p><p></p><p>Barrel life wise, too early to say for sure, but our initial thoughts are its worse than Retumbo, but not as bad as N570.</p><p> </p><p></p><p>The temp one is the biggie for you I know, but its so hard to get exact results here as unless you were able to subject both rifle and ammo to the extremes of ambient temperature on more or less the same day to be sure your ammo hasn't changed in any way (neck tension due to a degree of cold welding or number of loadings or age; different batches of powder, bullets, primers, brass etc etc), you never can be sure just what your results are showing. We have proved that just freezing/warming your rifle and ammo isn't good enough. You need to actually test at the correct ambient air temp as well. And this all gets very hard to do, which is why we see such different results from temperature testing , as no-one can possibly replicate all these variables on the same day.</p><p> </p><p></p><p>As I said, from our extensive testing in the field, we have learned to work with the minor temp issues with Re33, and all its other advantages outweigh what to us is a minor disadvantage.</p><p> Greg</p></blockquote><p></p>
[QUOTE="NZ Longranger, post: 1044199, member: 14"] [FONT="]Jon, We have just gone to huge lengths to land a large shipment of Re33, and yet we have Retumbo, H1000 and N570 in stock already, so that tells you our thoughts, but then you already knew them![/FONT] [FONT="] Here are the proven facts across our Oehler 43 Ballistic Lab.[/FONT] [FONT="] Re 33 produces more velocity for pressure than N570 or Retumbo, see this comparison in our 28” barrelled 338FX (338 Lapua improved) all loaded to the same 65,000psi pressure:[/FONT] [FONT="]Re33 - 250gn 3290fps, 300gn 2980fps. [/FONT][FONT="][/FONT] [FONT="]N570 – 250gn 3270fps, 300gn 2965fps. [/FONT][FONT="][/FONT] [FONT="]Retumbo/2225 – 300gn 2930fps.[/FONT][FONT="][/FONT] [FONT="]OBP716 – 250gn 3325fps, 300gn 2990fps.[/FONT][FONT="][/FONT] [FONT="]US869 – 300gn 2980fps.[/FONT][FONT="][/FONT] [FONT="]Re25 – 300gn 2920fps. [/FONT] [FONT="][/FONT][FONT="][/FONT] There is a small gain 10 to 20fps over N570, but a much larger 50fps gain over Retumbo. It will [B]not[/B] produce 150fps more than Retumbo in an Edge for the same pressure. Again, about 50 to 60 fps increase. In our rifles it has proved to be significantly more accurate than N570. It fills the case up more nicely than N570. The above are facts, although the accuracy may differ in other rifles. Now we come to the not so definites. Temperature sensitivity wise, it definitely exhibits more than Retumbo and N570, but it hasn’t been significant enough that we can’t work with it at our possibly less extreme temps. From 32F to 82F we can live with it, using the powder temp feature on Shooter or AB to allow for it. Barrel temp seems to be as important as powder temp, so we use a fudge factor to incorporate noth. N570 has exhibited some funny temp/pressure spike issues of its own below 40F for us, but is more stable velocity wise through the usual 40F to 75F temps. Barrel life wise, too early to say for sure, but our initial thoughts are its worse than Retumbo, but not as bad as N570. The temp one is the biggie for you I know, but its so hard to get exact results here as unless you were able to subject both rifle and ammo to the extremes of ambient temperature on more or less the same day to be sure your ammo hasn’t changed in any way (neck tension due to a degree of cold welding or number of loadings or age; different batches of powder, bullets, primers, brass etc etc), you never can be sure just what your results are showing. We have proved that just freezing/warming your rifle and ammo isn’t good enough. You need to actually test at the correct ambient air temp as well. And this all gets very hard to do, which is why we see such different results from temperature testing , as no-one can possibly replicate all these variables on the same day. As I said, from our extensive testing in the field, we have learned to work with the minor temp issues with Re33, and all its other advantages outweigh what to us is a minor disadvantage. Greg [/QUOTE]
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