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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 Sherman Build (This Is My Boomstick!)
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<blockquote data-quote="benchracer" data-source="post: 1365200" data-attributes="member: 22069"><p>[ATTACH=full]84416[/ATTACH] I finally got around to doing some accuracy work. I started with the Berger 250 EH and RL-17. As you can see, best accuracy showed up @ 62.0 grains. The 62.0 group measured just under .900". That was OK, but I felt like there was more to be had.</p><p></p><p>Under normal circumstances, I begin load development by testing seating depth. However, since the Sherman is a wildcat cartridge, I had begun my work by seating .010" off the lands and generating a load map for the cartridge. With best powder charge figured out, it was clear that I needed to tune the load by testing seating depth.</p><p></p><p>Here, I found myself on the horns of a dilemma. My normal procedure is to begin testing seating depth @ .040" intervals, as recommended by Berger. However, for the sake of performance, using every bit of available case capacity in the 338 Sherman is critical. Moreover, I knew the 62.0 grain charge to be very near to max with this combination. I was concerned that .040" intervals might be too coarse of an adjustment, both in terms of available case capacity and in terms of safety.</p><p></p><p>I decided to discuss the matter with Rich (elkaholic), who recommended that I test .020" and .030" off the lands...</p></blockquote><p></p>
[QUOTE="benchracer, post: 1365200, member: 22069"] [ATTACH=full]84416[/ATTACH] I finally got around to doing some accuracy work. I started with the Berger 250 EH and RL-17. As you can see, best accuracy showed up @ 62.0 grains. The 62.0 group measured just under .900". That was OK, but I felt like there was more to be had. Under normal circumstances, I begin load development by testing seating depth. However, since the Sherman is a wildcat cartridge, I had begun my work by seating .010" off the lands and generating a load map for the cartridge. With best powder charge figured out, it was clear that I needed to tune the load by testing seating depth. Here, I found myself on the horns of a dilemma. My normal procedure is to begin testing seating depth @ .040" intervals, as recommended by Berger. However, for the sake of performance, using every bit of available case capacity in the 338 Sherman is critical. Moreover, I knew the 62.0 grain charge to be very near to max with this combination. I was concerned that .040" intervals might be too coarse of an adjustment, both in terms of available case capacity and in terms of safety. I decided to discuss the matter with Rich (elkaholic), who recommended that I test .020" and .030" off the lands... [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 Sherman Build (This Is My Boomstick!)
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