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Hunting
Long Range Hunting & Shooting
270-300 Win Mag now feasible
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<blockquote data-quote="Buckammo" data-source="post: 1233488" data-attributes="member: 95955"><p>Well, its official, I am done with Alliant powders. I just completed testing my 270 Rem Mag loads with R-26 and the 170gr. Berger. At 78 degrees 65 grains of R-26 produced 2970+/-3fps. At -5 degrees F (Rifle and ammo in the deep freeze over night) the load gave 2398+/-39.6fps and did not produce enough pressure to seal the chamber. And to top it off, the decay in velocity is not linear. While shooting on the 1000 yard range two weeks ago, it was 52 F and the velocity registered 2962fps......</p><p></p><p>I also tested a load for my .260 AI using R-23. The velocity for that load went up by 86fps and popped a primer. This load had previously only showed 58KPSI. I did not have the strain gauge attached to the rifle when testing out of the freezer. My old load with H-4350 had a delta v/t value of 0.11 fps/degree F.</p><p></p><p>I am sorry Hodgdon. I will never stray again.</p></blockquote><p></p>
[QUOTE="Buckammo, post: 1233488, member: 95955"] Well, its official, I am done with Alliant powders. I just completed testing my 270 Rem Mag loads with R-26 and the 170gr. Berger. At 78 degrees 65 grains of R-26 produced 2970+/-3fps. At -5 degrees F (Rifle and ammo in the deep freeze over night) the load gave 2398+/-39.6fps and did not produce enough pressure to seal the chamber. And to top it off, the decay in velocity is not linear. While shooting on the 1000 yard range two weeks ago, it was 52 F and the velocity registered 2962fps...... I also tested a load for my .260 AI using R-23. The velocity for that load went up by 86fps and popped a primer. This load had previously only showed 58KPSI. I did not have the strain gauge attached to the rifle when testing out of the freezer. My old load with H-4350 had a delta v/t value of 0.11 fps/degree F. I am sorry Hodgdon. I will never stray again. [/QUOTE]
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270-300 Win Mag now feasible
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