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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6.5 156 EOL
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<blockquote data-quote="Greyfox" data-source="post: 1680414" data-attributes="member: 10291"><p>I did some additional testing trying to see the effects of R26 in 85F temperature. Overall, shots from a barrel chamber at ambient temperatures tested from 65F to 85F were running at a consistent velocity of 2990, SD 5(5 shots). At 85F the other day, I purposely fired an additional 10 shots with less then 1 minute of cooling with the barrel "hot to the touch", velocity jumped to 3010FPS, SD 9(5 shots). When ai let the rifle/ammo sit for an hour(out of the sun) and retested, I was back to 2990FPS. This was a 20FPS increase due to a hot chamber, and not much different from similar tests I've done with my PRS load(6.5x47@2891FPS) at these hot summer temperatures using H4350, well established for being a very temperature stabile powder. However, my heavy barreled PRS rifle(MTU) with a lower intensity load, the % increase in velocity is less, and takes longer. All velocity work was done using my Lab Radar.</p><p>Overall, I think I've settled on a load for the Berger 156 Elite Hunter in my 6.5x284. For my hunting, rarely exceeding 75F I think any of the temperature effects seen with R26 will not be an issue. While I believe I could have run this bullet well at an additional 20-30FPS in my rifle, I was quite happy with the ballistics, and lower pressure with a velocity in the 3000FPS range. At this velocity, the 156gr Berger is very accurate with low SD's. It buys me an 20% increase in energy, getting me to 1000FPE at 1200 yards compared 1000 yards with the 140 class bullets. At this point, I'm anxious test this bullet at long range, and understand how this bullet performs on game. Shown:200 yard performance.</p><p></p><p>[ATTACH]142795[/ATTACH] [ATTACH]142796[/ATTACH] [ATTACH]142797[/ATTACH]</p></blockquote><p></p>
[QUOTE="Greyfox, post: 1680414, member: 10291"] I did some additional testing trying to see the effects of R26 in 85F temperature. Overall, shots from a barrel chamber at ambient temperatures tested from 65F to 85F were running at a consistent velocity of 2990, SD 5(5 shots). At 85F the other day, I purposely fired an additional 10 shots with less then 1 minute of cooling with the barrel “hot to the touch”, velocity jumped to 3010FPS, SD 9(5 shots). When ai let the rifle/ammo sit for an hour(out of the sun) and retested, I was back to 2990FPS. This was a 20FPS increase due to a hot chamber, and not much different from similar tests I’ve done with my PRS load(6.5x47@2891FPS) at these hot summer temperatures using H4350, well established for being a very temperature stabile powder. However, my heavy barreled PRS rifle(MTU) with a lower intensity load, the % increase in velocity is less, and takes longer. All velocity work was done using my Lab Radar. Overall, I think I’ve settled on a load for the Berger 156 Elite Hunter in my 6.5x284. For my hunting, rarely exceeding 75F I think any of the temperature effects seen with R26 will not be an issue. While I believe I could have run this bullet well at an additional 20-30FPS in my rifle, I was quite happy with the ballistics, and lower pressure with a velocity in the 3000FPS range. At this velocity, the 156gr Berger is very accurate with low SD’s. It buys me an 20% increase in energy, getting me to 1000FPE at 1200 yards compared 1000 yards with the 140 class bullets. At this point, I’m anxious test this bullet at long range, and understand how this bullet performs on game. Shown:200 yard performance. [ATTACH]142795[/ATTACH] [ATTACH]142796[/ATTACH] [ATTACH]142797[/ATTACH] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6.5 156 EOL
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