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Long Range Hunting & Shooting
6.5-284 load development (changing powder)
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<blockquote data-quote="Greyfox" data-source="post: 1526385" data-attributes="member: 10291"><p>Having recently completed a new 6.5x284 build, I decided to do some testing with R26. Most of my prior loadwork using VLD style bullets in the 140-143gr weight range has been with H4831sc(targets), Retumbo(Hunting). While I have tried other powders in this burn range, and they can work, my best accuracy and ES was achieved with these temperature stable powders which have proven to give very consistent performance over several years with my 6.5x284 rifles. I did little a work over the summer months with R26 but found that my velocities were inconsistent at +80F with +30FPS variations. With other reports claiming similar temperature variations at warm temperatures, I figured that I'd try it again in the cooler months, more in line with my hunting temperatures. Recent testing of R26 at temperatures in the 30-50F range proved to be more consistent. Velocity was the same, but ES was equal or better then Retumbo in most cases with my new barrel.. At these temperatures, 54.8gr of a R26 would produce velocities in the 3050FPS range with Berger 140 HVLD's, same as 58gr of Retumbo. While near max, no pressure signs were seen at these charge weights. While I probably could do more fine tuning, Retumbo produced better and more consistent accuracy, but the ES of R26 was a bit better. Since I prefer to run my velocity in the 2975-3000FPS range, backing off 1gr of powder of each delivers this velocity range with the same accuracy/ES results.</p></blockquote><p></p>
[QUOTE="Greyfox, post: 1526385, member: 10291"] Having recently completed a new 6.5x284 build, I decided to do some testing with R26. Most of my prior loadwork using VLD style bullets in the 140-143gr weight range has been with H4831sc(targets), Retumbo(Hunting). While I have tried other powders in this burn range, and they can work, my best accuracy and ES was achieved with these temperature stable powders which have proven to give very consistent performance over several years with my 6.5x284 rifles. I did little a work over the summer months with R26 but found that my velocities were inconsistent at +80F with +30FPS variations. With other reports claiming similar temperature variations at warm temperatures, I figured that I’d try it again in the cooler months, more in line with my hunting temperatures. Recent testing of R26 at temperatures in the 30-50F range proved to be more consistent. Velocity was the same, but ES was equal or better then Retumbo in most cases with my new barrel.. At these temperatures, 54.8gr of a R26 would produce velocities in the 3050FPS range with Berger 140 HVLD’s, same as 58gr of Retumbo. While near max, no pressure signs were seen at these charge weights. While I probably could do more fine tuning, Retumbo produced better and more consistent accuracy, but the ES of R26 was a bit better. Since I prefer to run my velocity in the 2975-3000FPS range, backing off 1gr of powder of each delivers this velocity range with the same accuracy/ES results. [/QUOTE]
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6.5-284 load development (changing powder)
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