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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 Mega
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<blockquote data-quote="PapaSmurff" data-source="post: 2839128" data-attributes="member: 118512"><p>As promised I'm gonna continue to update throughout the first 338 Mega load development process. I finished fire forming 100 pieces of brass this afternoon. As of today I was shooting 64-65 grains of N550 with 250 Bergers. I also tried 2 different neck tensions (.364 and .366 bushings). It seemed as though the .366 bushing gave me around 2" groups at 300 yards and the .364" bushings gave me around 3" groups at 300 yards with this new brass. I'm posting a picture below of both my 300 yard targets: the left one (red/white) is with .366" neck bushing neck tension, the one on the right (red/black) is with the .364" neck bushing. Today I was currently getting 2,700 fps with 64.0 grains of N550 and 2,750 fps with 65.0 grains. I shot a pressure test and encountered stiff bolt lift at 69.0 grains for a max speed of 2,893 fps. My once fired brass is in the tumbler as I write this and hoping to start load development either tomorrow or Thursday afternoon.</p></blockquote><p></p>
[QUOTE="PapaSmurff, post: 2839128, member: 118512"] As promised I’m gonna continue to update throughout the first 338 Mega load development process. I finished fire forming 100 pieces of brass this afternoon. As of today I was shooting 64-65 grains of N550 with 250 Bergers. I also tried 2 different neck tensions (.364 and .366 bushings). It seemed as though the .366 bushing gave me around 2” groups at 300 yards and the .364” bushings gave me around 3” groups at 300 yards with this new brass. I’m posting a picture below of both my 300 yard targets: the left one (red/white) is with .366” neck bushing neck tension, the one on the right (red/black) is with the .364” neck bushing. Today I was currently getting 2,700 fps with 64.0 grains of N550 and 2,750 fps with 65.0 grains. I shot a pressure test and encountered stiff bolt lift at 69.0 grains for a max speed of 2,893 fps. My once fired brass is in the tumbler as I write this and hoping to start load development either tomorrow or Thursday afternoon. [/QUOTE]
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