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Rifles, Reloading, Optics, Equipment
Reloading
IMR 4451 and 7977 Enduron Powders ...
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<blockquote data-quote="paste" data-source="post: 1066127" data-attributes="member: 17790"><p>I recently bought one each of these powders to try in my 300 win mag and my 6.5 x 47 lapua.</p><p>here is what i did, now im not saying that the way i did this is the right way but it seems to work for me.</p><p>IMR 7977 for the 300 win mag</p><p> norma 300 win mag brass w fed 215 primers and 208 A-max seated .025 off the lands. my cartridge length using a Sinclair comparator with 30 cal. insert is 2.860 to the ogive.</p><p>i started at 73.3 grs and worked up in .3 grain increments to 76.0 grs.</p><p>at 76.0 grains i am not to the point of having a compressed load so i might be able to get a little more in the case but i personally don't like to do compressed loads. at 76.0 grs i have no pressure signs of any sort.</p><p>below is what i came up with using my chrony chronograph</p><p>i should also note that my rifle has a 28 inch brux barrel with a 10 twist</p><p> </p><p>73.3 grs = 2683 fps</p><p>73.6 = 2688</p><p>73.9 = 2712</p><p>74.2 = 2743</p><p>74.5 = 2746</p><p>74.8 = 2747</p><p>75.1 = 2767</p><p>75.4 = 2804</p><p>75.7 = 2770</p><p>76.0 = 2797</p><p> </p><p>I'm not sure what happened with the 75.4 load but that is what my chrony showed. when i get a chance i plan on starting at 75.0 grs and work as far as i can without compressing or till i start showing pressure</p><p>i hope this can help you and like i said before, this is what works for me when i am trying a new powder and im not trying to say its the best</p><p>if anyone is interested i did the same process with the IMR 4451 powder in my 6.5x47 lapua for which there is no published data for this powder.</p></blockquote><p></p>
[QUOTE="paste, post: 1066127, member: 17790"] I recently bought one each of these powders to try in my 300 win mag and my 6.5 x 47 lapua. here is what i did, now im not saying that the way i did this is the right way but it seems to work for me. IMR 7977 for the 300 win mag norma 300 win mag brass w fed 215 primers and 208 A-max seated .025 off the lands. my cartridge length using a Sinclair comparator with 30 cal. insert is 2.860 to the ogive. i started at 73.3 grs and worked up in .3 grain increments to 76.0 grs. at 76.0 grains i am not to the point of having a compressed load so i might be able to get a little more in the case but i personally don't like to do compressed loads. at 76.0 grs i have no pressure signs of any sort. below is what i came up with using my chrony chronograph i should also note that my rifle has a 28 inch brux barrel with a 10 twist 73.3 grs = 2683 fps 73.6 = 2688 73.9 = 2712 74.2 = 2743 74.5 = 2746 74.8 = 2747 75.1 = 2767 75.4 = 2804 75.7 = 2770 76.0 = 2797 I'm not sure what happened with the 75.4 load but that is what my chrony showed. when i get a chance i plan on starting at 75.0 grs and work as far as i can without compressing or till i start showing pressure i hope this can help you and like i said before, this is what works for me when i am trying a new powder and im not trying to say its the best if anyone is interested i did the same process with the IMR 4451 powder in my 6.5x47 lapua for which there is no published data for this powder. [/QUOTE]
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IMR 4451 and 7977 Enduron Powders ...
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