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Rifles, Reloading, Optics, Equipment
Reloading
338-378wby load development questions.
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<blockquote data-quote="jbs2014" data-source="post: 1607123" data-attributes="member: 94052"><p>I have seen differences from lot to lot with Retumbo. I had a good load with 133 grains behind a 420 grain bullet in .408 Cheytac, switched to a different lot and had to up the charge to 135 grains. I need to just buy 32 LBs or more from the same lot to alleviate this issue since I have use Retumbo in 3 different calibers.</p><p></p><p>With new 338-378 Weatherby brass, my load for a 275 grain bullet was 106 grains of Retumbo for 3056 FPS and a 10 FPS ES. However, when I took once fired brass and set the shoulder back .001 it messed everything up, ES was up to 22 FPS and the velocity went up to 3077 average. Same lot of powder, primers, and bullets. So it seems that the .001 shoulder setback on the once fired case changed things a bit. I will likely have to drop the charge a few tenths of a grain to get it where I need it.</p></blockquote><p></p>
[QUOTE="jbs2014, post: 1607123, member: 94052"] I have seen differences from lot to lot with Retumbo. I had a good load with 133 grains behind a 420 grain bullet in .408 Cheytac, switched to a different lot and had to up the charge to 135 grains. I need to just buy 32 LBs or more from the same lot to alleviate this issue since I have use Retumbo in 3 different calibers. With new 338-378 Weatherby brass, my load for a 275 grain bullet was 106 grains of Retumbo for 3056 FPS and a 10 FPS ES. However, when I took once fired brass and set the shoulder back .001 it messed everything up, ES was up to 22 FPS and the velocity went up to 3077 average. Same lot of powder, primers, and bullets. So it seems that the .001 shoulder setback on the once fired case changed things a bit. I will likely have to drop the charge a few tenths of a grain to get it where I need it. [/QUOTE]
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338-378wby load development questions.
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