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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
My 6.5 Sherman rifle and load development thread
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<blockquote data-quote="dok7mm" data-source="post: 1351321" data-attributes="member: 90080"><p>I had planned to run a 400 yd ladder test today, with R-26 and N-570 w/140 HVLDs, but between a horrible mirage and a failing battery pack on my LabRadar, it turned into a velocity/pressure test. I had to switch to the MagnetoSpeed and that played havoc with my ladders.</p><p></p><p>It was 20* cooler than when I first tried R-26 & I had smears and sticky bolt @ 59.0 gr and 3,040 fps. Today, I ran it to 61.0 gr. @ 3,160 fps and no pressure signs on brass or bolt. I still have a bit more room, so I'll try to see where max is. I do believe the the R-26 gets wild at 85* and hotter.</p><p></p><p>Thanks to BEEMAN and ramrod79 for their data on N-570 and the Berger 140. I also ran that load up to 65.0 gr @ 3,158 with no pressure signs. This load also needs more testing & will find my max pressure. This was 6th firing on turned Norma 280 brass. </p><p></p><p>I need to establish that the seating depth ( I used the .015" jump of my Retumbo loads w/140) is correct with these powders. This is from a 26" Bartlein 5r, 3B contour @ 1550 ASL, 70*, 29% humidity, 28.55 station pressure, wind variable 2-6 mph.</p><p></p><p>FYI, my current accuracy load w/63.9 gr Retumbo 5 shot average is 3,139 fps, sd-3.3, ed-8.0 and usually will shoot 1/4 moa @ 400 yd.This load was worked up @ 90*, but handles temp range very well. I have to drive 1 hour to 1000 yd range and will do that when I decide loads to take.</p><p></p><p>Korhil78, Thanks for the use of your thread.</p></blockquote><p></p>
[QUOTE="dok7mm, post: 1351321, member: 90080"] I had planned to run a 400 yd ladder test today, with R-26 and N-570 w/140 HVLDs, but between a horrible mirage and a failing battery pack on my LabRadar, it turned into a velocity/pressure test. I had to switch to the MagnetoSpeed and that played havoc with my ladders. It was 20* cooler than when I first tried R-26 & I had smears and sticky bolt @ 59.0 gr and 3,040 fps. Today, I ran it to 61.0 gr. @ 3,160 fps and no pressure signs on brass or bolt. I still have a bit more room, so I'll try to see where max is. I do believe the the R-26 gets wild at 85* and hotter. Thanks to BEEMAN and ramrod79 for their data on N-570 and the Berger 140. I also ran that load up to 65.0 gr @ 3,158 with no pressure signs. This load also needs more testing & will find my max pressure. This was 6th firing on turned Norma 280 brass. I need to establish that the seating depth ( I used the .015" jump of my Retumbo loads w/140) is correct with these powders. This is from a 26" Bartlein 5r, 3B contour @ 1550 ASL, 70*, 29% humidity, 28.55 station pressure, wind variable 2-6 mph. FYI, my current accuracy load w/63.9 gr Retumbo 5 shot average is 3,139 fps, sd-3.3, ed-8.0 and usually will shoot 1/4 moa @ 400 yd.This load was worked up @ 90*, but handles temp range very well. I have to drive 1 hour to 1000 yd range and will do that when I decide loads to take. Korhil78, Thanks for the use of your thread. [/QUOTE]
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My 6.5 Sherman rifle and load development thread
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