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Rifles, Reloading, Optics, Equipment
Reloading
280 AI Velocity problems!?
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<blockquote data-quote=".300 Dakota" data-source="post: 1768324" data-attributes="member: 106514"><p>I, too, have had substandard velocity over what I expected with my custom 280 AI with 26" Criterion barrel. To put it in perspective, I have a 284 Winchester with long leade in a McGowen barrel that shoots Berger 180s at 2945 f/s. My 280 AI with the same bullets only get around 2800 and change. It also has a long leade, but maybe not quite as long as the McGowen. Accuracy outperforms the 284, however, with groups well under 1/2 MOA, while the 284 hovers right at 1/2 MOA and just above.</p><p></p><p>First of all, 4831 is one of the SLOWEST powders you can shoot. No, I don't mean slow burning. It is what I would consider moderate-slow burn rate. I mean with the velocities it generates. It is more pronounced in some cartridges than others. I don'tbthink you need Reloader 26 with 140 grain bullet. If you want SPEED, try IMR 4955. It is almost interchangeable with 4831and will produce speeds far exceeding the 4831 loads of comparable weight. Accuracy may suffer...or not. Other good alternatives I have found for more speed is Vihta Vuori N560, Norma MRP, and Alliant's 4000MR. One of these will cure your speed issue. And besides...good luck finding Reloader 26, even if you switch to 180 grain bullets where it might be beneficial.</p></blockquote><p></p>
[QUOTE=".300 Dakota, post: 1768324, member: 106514"] I, too, have had substandard velocity over what I expected with my custom 280 AI with 26" Criterion barrel. To put it in perspective, I have a 284 Winchester with long leade in a McGowen barrel that shoots Berger 180s at 2945 f/s. My 280 AI with the same bullets only get around 2800 and change. It also has a long leade, but maybe not quite as long as the McGowen. Accuracy outperforms the 284, however, with groups well under 1/2 MOA, while the 284 hovers right at 1/2 MOA and just above. First of all, 4831 is one of the SLOWEST powders you can shoot. No, I don't mean slow burning. It is what I would consider moderate-slow burn rate. I mean with the velocities it generates. It is more pronounced in some cartridges than others. I don'tbthink you need Reloader 26 with 140 grain bullet. If you want SPEED, try IMR 4955. It is almost interchangeable with 4831and will produce speeds far exceeding the 4831 loads of comparable weight. Accuracy may suffer...or not. Other good alternatives I have found for more speed is Vihta Vuori N560, Norma MRP, and Alliant's 4000MR. One of these will cure your speed issue. And besides...good luck finding Reloader 26, even if you switch to 180 grain bullets where it might be beneficial. [/QUOTE]
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280 AI Velocity problems!?
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