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Rifles, Reloading, Optics, Equipment
Reloading
Temperature Sensitivity of Alliant Reloder 26
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<blockquote data-quote="RevJim" data-source="post: 1314139" data-attributes="member: 86754"><p>Thanks for the test! I really like R26, in some cartridges I have yet to get the accuracy I was quickly looking for, not saying I couldn't have tested seating depth more. I think a powder's temp sensitivity depends on the size of the case. For example, R19 gave me almost a 200fps drop ( was checking my zero for a late season cow elk hunt, was shooting "patterns" so ran them over a chrono.) in a 338 WinMag/185 XLC load that had been worked up in 90 deg,one cold December at 10 degrees. I pulled the bullets and the powder (barely a compressed load) had to be dug out w/screwdriver! A fast workup in one day with H4350 saved my hunt. In two .240 Weatherbies/90X,TXS,etc R19 is stable as a rock! So testing, as you have done saves time later for those who can do it. But it always pays to check velocity ( zero for sure) when the temp drops. Most people ( and rightfully so) pay more attention to hot days than cold days. </p><p> I have a friend in South Africa who was using a known load in his .308 (180 MagTip) and Somchem Powder (sp?) on a cull Eland hunt in the Draknor (again, sp?) mountains around zero degrees. The bullet barely got through the hide! He finally made a headshot that "barely" got into the brain, this was all done at under 100yds too. He was bumfuzzled, but learned a good lesson. He fortunately had a backup rifle, another 308 but using Military fmj ammo for headshots. He was a former soldier who used an R1 (FN FAL South African copy) for over a dozen years so he knew it would work at cold temps. It pays to check ones ammo at severe temp swings for sure.</p></blockquote><p></p>
[QUOTE="RevJim, post: 1314139, member: 86754"] Thanks for the test! I really like R26, in some cartridges I have yet to get the accuracy I was quickly looking for, not saying I couldn't have tested seating depth more. I think a powder's temp sensitivity depends on the size of the case. For example, R19 gave me almost a 200fps drop ( was checking my zero for a late season cow elk hunt, was shooting "patterns" so ran them over a chrono.) in a 338 WinMag/185 XLC load that had been worked up in 90 deg,one cold December at 10 degrees. I pulled the bullets and the powder (barely a compressed load) had to be dug out w/screwdriver! A fast workup in one day with H4350 saved my hunt. In two .240 Weatherbies/90X,TXS,etc R19 is stable as a rock! So testing, as you have done saves time later for those who can do it. But it always pays to check velocity ( zero for sure) when the temp drops. Most people ( and rightfully so) pay more attention to hot days than cold days. I have a friend in South Africa who was using a known load in his .308 (180 MagTip) and Somchem Powder (sp?) on a cull Eland hunt in the Draknor (again, sp?) mountains around zero degrees. The bullet barely got through the hide! He finally made a headshot that "barely" got into the brain, this was all done at under 100yds too. He was bumfuzzled, but learned a good lesson. He fortunately had a backup rifle, another 308 but using Military fmj ammo for headshots. He was a former soldier who used an R1 (FN FAL South African copy) for over a dozen years so he knew it would work at cold temps. It pays to check ones ammo at severe temp swings for sure. [/QUOTE]
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Temperature Sensitivity of Alliant Reloder 26
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