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Rifles, Reloading, Optics, Equipment
Reloading
7MM WSM velocity verses powder charge question.
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<blockquote data-quote="LouBoyd" data-source="post: 555233" data-attributes="member: 9253"><p>No, since I don'have a rifle chambered in 7mm WSM. However I do have other rifles which use longer than SAAMI length COAL and I use Quickload regularly to predict their performance. Its usually within 50 fps for 3000 fps cartridges. </p><p></p><p>Here are Quickload simulatiions assuming a 27 inch barrel with a 180 Berger seated to 3.15" COAL. All other inputs are Quickload defaults. </p><p> </p><p>65 grain IMR 7828 : 2949 fps @ 58271 psi - a reasonable load - I'd use it .</p><p>64 grain H4831sc: 2879 fps @ 58329 psi - a reasonable load</p><p>66 grain RL 25: 2891 fps @ 54424 psi - 67 grains would be more reasonable. 2929 fps.</p><p>61 grain RL 17: 2982 fps @ 69432 - OVER SAAMI MAX PRESSURE</p><p></p><p>The results you're getting aren't unreasonable. Without being there it's hard to know what might be wrong, if anything. Have you measured the actual case capacity of your fired brass? Quickload assumes 81.1 grains H2O. Quickload also assumes the bullet is seated close to but not on the lands as the default. </p><p></p><p>Disclaimer: Quicklload is only as good as the info given and assumptions made. Always work up loads carefully and watch for pressure signs.</p></blockquote><p></p>
[QUOTE="LouBoyd, post: 555233, member: 9253"] No, since I don'have a rifle chambered in 7mm WSM. However I do have other rifles which use longer than SAAMI length COAL and I use Quickload regularly to predict their performance. Its usually within 50 fps for 3000 fps cartridges. Here are Quickload simulatiions assuming a 27 inch barrel with a 180 Berger seated to 3.15" COAL. All other inputs are Quickload defaults. 65 grain IMR 7828 : 2949 fps @ 58271 psi - a reasonable load - I'd use it . 64 grain H4831sc: 2879 fps @ 58329 psi - a reasonable load 66 grain RL 25: 2891 fps @ 54424 psi - 67 grains would be more reasonable. 2929 fps. 61 grain RL 17: 2982 fps @ 69432 - OVER SAAMI MAX PRESSURE The results you're getting aren't unreasonable. Without being there it's hard to know what might be wrong, if anything. Have you measured the actual case capacity of your fired brass? Quickload assumes 81.1 grains H2O. Quickload also assumes the bullet is seated close to but not on the lands as the default. Disclaimer: Quicklload is only as good as the info given and assumptions made. Always work up loads carefully and watch for pressure signs. [/QUOTE]
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Reloading
7MM WSM velocity verses powder charge question.
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