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Rifles, Reloading, Optics, Equipment
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<blockquote data-quote="TRexF16" data-source="post: 2353855" data-attributes="member: 108912"><p>Just curious but do you have access to any pressure-tested data for IMR 4166 in the 280 AI? The closest cartridge I could find with a quick look was the 270 Win and their 64K PSI loads were far below yours for both the 140 and 150 grain charges. Obviously the 280 AI would use bigger charges than the 270 Win for two reasons - slightly greater bullet diameter, and slightly greater case capacity. I know 4166 is supposed to be kind of a substitute for VARGET but that does not necessarily relate to charges, but published max charges for VARGET in the 280 AI is a lot lower too.</p><p>Do you have velocities for these loads? That's probably a much more reliable indication of pressure than any visible signs. I would look at the velocities Hodgdon got with VARGET with 140 and 150 grain bullets at max pressure in the .280 AI (2903 FPS for the 140 and 2750 to 2800 for the 150, depending on the bullet) and not trespass above that.</p><p>I would figure 4166 a bit on the too fast side for the bullet weight you're using. That said, 2900 FPS with the 143 Hammer will sure kill fine.</p><p></p><p>Just my two bit first impressions and questions,</p><p>Cheers,</p><p>Rex</p></blockquote><p></p>
[QUOTE="TRexF16, post: 2353855, member: 108912"] Just curious but do you have access to any pressure-tested data for IMR 4166 in the 280 AI? The closest cartridge I could find with a quick look was the 270 Win and their 64K PSI loads were far below yours for both the 140 and 150 grain charges. Obviously the 280 AI would use bigger charges than the 270 Win for two reasons - slightly greater bullet diameter, and slightly greater case capacity. I know 4166 is supposed to be kind of a substitute for VARGET but that does not necessarily relate to charges, but published max charges for VARGET in the 280 AI is a lot lower too. Do you have velocities for these loads? That's probably a much more reliable indication of pressure than any visible signs. I would look at the velocities Hodgdon got with VARGET with 140 and 150 grain bullets at max pressure in the .280 AI (2903 FPS for the 140 and 2750 to 2800 for the 150, depending on the bullet) and not trespass above that. I would figure 4166 a bit on the too fast side for the bullet weight you're using. That said, 2900 FPS with the 143 Hammer will sure kill fine. Just my two bit first impressions and questions, Cheers, Rex [/QUOTE]
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