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Rifles, Reloading, Optics, Equipment
Reloading
Load development ?
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<blockquote data-quote="Alan Griffith" data-source="post: 648614" data-attributes="member: 4686"><p>Just had 7mmRHB fix a few issues that the custom builder botched on my 6.5x47. 7mmRBH asked how I was going to shoot my rifle; meaning how fast or how hot was I going to allow it to get. He likes to place a pad or upward pressure under the 1st 1" to 1-1/2" of barrel to dampen vibrations. This is better for accuracy but can start to destroy it if one lets the barrel heat up. I asked him to place the pressure pad as this rifle was built for hunting and should not see any sustained heat in the barrel. Well, just the other day while working on some load development, I would shoot 3 sets of 15 shots in 5-shot increments. The first 5 were from a cold barrel. I would then go on to shoot the next 5 while the barrel would stay warm and the next 5 not letting barrel cool at all. It got hot. The groups were as follows.</p><p></p><p>6.5x47 Lapua</p><p>Nosler 140 gr CC</p><p>40.3 gr H4350</p><p>CCI 400</p><p></p><p>These were 5-shot groups but I marked the best 4 and then 5th shot.</p><p></p><p>CCI 400 2825 av Cold .42"/.9"</p><p>3.130" dead 22 ES Warm 1.2"/1.2"</p><p>15 shots 5 SD Hot 1.1"/1.84"</p><p>2.89 bushing </p><p></p><p>CCI 400 2831 av Cold .66"/1.17"</p><p>3.130" dead 36 ES Warm .57"/.82"</p><p>15 shots 8 SD Hot .7"/.88"</p><p>.288 bushing </p><p></p><p>CCI 400 2827 av Cold .78"/.84"</p><p>3.130" dead 31 ES Warm .86"/1.02"</p><p>15 shots 9 SD Hot 1.3"/1.63"</p><p>.287 bushing </p><p></p><p>7mmRHB suggest total free float if the barrel is expected to get hot. </p><p></p><p>Alan</p></blockquote><p></p>
[QUOTE="Alan Griffith, post: 648614, member: 4686"] Just had 7mmRHB fix a few issues that the custom builder botched on my 6.5x47. 7mmRBH asked how I was going to shoot my rifle; meaning how fast or how hot was I going to allow it to get. He likes to place a pad or upward pressure under the 1st 1" to 1-1/2" of barrel to dampen vibrations. This is better for accuracy but can start to destroy it if one lets the barrel heat up. I asked him to place the pressure pad as this rifle was built for hunting and should not see any sustained heat in the barrel. Well, just the other day while working on some load development, I would shoot 3 sets of 15 shots in 5-shot increments. The first 5 were from a cold barrel. I would then go on to shoot the next 5 while the barrel would stay warm and the next 5 not letting barrel cool at all. It got hot. The groups were as follows. 6.5x47 Lapua Nosler 140 gr CC 40.3 gr H4350 CCI 400 These were 5-shot groups but I marked the best 4 and then 5th shot. CCI 400 2825 av Cold .42"/.9" 3.130" dead 22 ES Warm 1.2"/1.2" 15 shots 5 SD Hot 1.1"/1.84" 2.89 bushing CCI 400 2831 av Cold .66"/1.17" 3.130" dead 36 ES Warm .57"/.82" 15 shots 8 SD Hot .7"/.88" .288 bushing CCI 400 2827 av Cold .78"/.84" 3.130" dead 31 ES Warm .86"/1.02" 15 shots 9 SD Hot 1.3"/1.63" .287 bushing 7mmRHB suggest total free float if the barrel is expected to get hot. Alan [/QUOTE]
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