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Rifles, Reloading, Optics, Equipment
Reloading
WARNING - 4955
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<blockquote data-quote="MSURunner" data-source="post: 2771258" data-attributes="member: 102961"><p>[ATTACH=full]446688[/ATTACH]</p><p>This was the QL pressure curve for probably about the last "safe" load with 4955. It's 48.0 gr, and using the HBN coated 75 gr X on a 22" it projects for 3270 fps. 60700 psi.</p><p></p><p>[ATTACH=full]446689[/ATTACH]</p><p>This is your 51.0 gr load. 3485 fps projected. 74960 psi.</p><p></p><p>[ATTACH=full]446690[/ATTACH]</p><p>This is one of the powders recommended by Barnes for the 80 gr TTSX, RL-17. This is 46.0 gr and projects to 3390 fps at 58960 psi.</p><p></p><p>I think that what you have experienced is shown in these graphs pretty well. IMR4955 pressures up much more quickly, and dissipates that pressure more quickly as well. I would surmise that it would thus hide pressure signs a bit more that one that stays at peak pressures longer. Not gonna beat a dead horse on don't go too far, too fast. I think that QL or GRT (FREE) are invaluable in load development efficiencies because of this data that you can pull from it related to how a powder pressures up. Is it gonna be perfect? No, as seen in that it didn't perfectly nail your velocities, but it would have given you a warning that it's going to be snappy on the high end and probably would have made your loads a bit more conservative.</p></blockquote><p></p>
[QUOTE="MSURunner, post: 2771258, member: 102961"] [ATTACH type="full" alt="Screenshot 2023-03-12 145531.png"]446688[/ATTACH] This was the QL pressure curve for probably about the last "safe" load with 4955. It's 48.0 gr, and using the HBN coated 75 gr X on a 22" it projects for 3270 fps. 60700 psi. [ATTACH type="full" alt="Screenshot 2023-03-12 145843.png"]446689[/ATTACH] This is your 51.0 gr load. 3485 fps projected. 74960 psi. [ATTACH type="full" alt="Screenshot 2023-03-12 145805.png"]446690[/ATTACH] This is one of the powders recommended by Barnes for the 80 gr TTSX, RL-17. This is 46.0 gr and projects to 3390 fps at 58960 psi. I think that what you have experienced is shown in these graphs pretty well. IMR4955 pressures up much more quickly, and dissipates that pressure more quickly as well. I would surmise that it would thus hide pressure signs a bit more that one that stays at peak pressures longer. Not gonna beat a dead horse on don't go too far, too fast. I think that QL or GRT (FREE) are invaluable in load development efficiencies because of this data that you can pull from it related to how a powder pressures up. Is it gonna be perfect? No, as seen in that it didn't perfectly nail your velocities, but it would have given you a warning that it's going to be snappy on the high end and probably would have made your loads a bit more conservative. [/QUOTE]
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WARNING - 4955
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