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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
RSI Shooting Lab
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<blockquote data-quote="AJ300MAG" data-source="post: 69827" data-attributes="member: 444"><p>Brent, the Accubonds are into the lands at 3.785". I had to recheck it, I thought I had written the value in my notes, but due to having to use the rifle as a repeater I load them to fit the magazine (3.690" O.A.L.)so I didn't record it. Kinda surprises me, the rifle has a few hundred rounds thru it, figured the throat might have moved. I did find one mistake, I had entered the actual size of the case, forgot to add the .003" to the measurement even though I read the instructions a few times. I changed it and had the program recalculate the data, pressure is still under 58k. Like you I figure 60k would be reasonable, the load doesn't show and sign of pressure, even while shooting it in hot weather. With my .300 Weatherby, shooting IMR 7828, I had to back off 1.5gr durring the summer heat, my max load was still below the IMR data.</p><p></p><p> I just installed a strain gauge on a .270WSM to investigate. This rifle shows pressure (extractor marks on the brass) at low load densities. I haven't shot it enough to get a read on primer pocket expansion, so the RSI data should prove interesting!</p><p></p><p>Al</p></blockquote><p></p>
[QUOTE="AJ300MAG, post: 69827, member: 444"] Brent, the Accubonds are into the lands at 3.785". I had to recheck it, I thought I had written the value in my notes, but due to having to use the rifle as a repeater I load them to fit the magazine (3.690" O.A.L.)so I didn't record it. Kinda surprises me, the rifle has a few hundred rounds thru it, figured the throat might have moved. I did find one mistake, I had entered the actual size of the case, forgot to add the .003" to the measurement even though I read the instructions a few times. I changed it and had the program recalculate the data, pressure is still under 58k. Like you I figure 60k would be reasonable, the load doesn't show and sign of pressure, even while shooting it in hot weather. With my .300 Weatherby, shooting IMR 7828, I had to back off 1.5gr durring the summer heat, my max load was still below the IMR data. I just installed a strain gauge on a .270WSM to investigate. This rifle shows pressure (extractor marks on the brass) at low load densities. I haven't shot it enough to get a read on primer pocket expansion, so the RSI data should prove interesting! Al [/QUOTE]
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