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Rifles, Reloading, Optics, Equipment
Reloading
Imr 4955 in 6mm creed?
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<blockquote data-quote="Carsyn.22" data-source="post: 2231438" data-attributes="member: 104613"><p>I just saw this thread now but I'll chime in, I am using IMR 4955 as a replacement for H4831 in 300 win mag R-P brass and CCI magnum primers. I just ran some pressure ladders in this 35 degree C weather with a 3 different combos.</p><p></p><p>178 AH loaded to 3.650" (seated to 2nd groove) both powders showed 3200 fps as the top safe load H4831 took 80 gr to do that and IMR 4955 took only 74.5 </p><p></p><p>168 Hornady BTHP loaded to 3.450 showed 76gr as the top and making 3250 fps</p><p></p><p>Now I will load down until I find accuracy. Hopefully....</p><p></p><p>In my limited experience it seems that 4955 makes about the same speed as 4831 but takes a few less grains to do it and slightly lower case fill, with 4955 once I started seeing pressure signs they built rapidly where 4831 is the opposite. Seems like it will be a decent powder for the lighter bullets in 300 win mag but with heavier bullets I think I would look elsewhere.</p></blockquote><p></p>
[QUOTE="Carsyn.22, post: 2231438, member: 104613"] I just saw this thread now but I'll chime in, I am using IMR 4955 as a replacement for H4831 in 300 win mag R-P brass and CCI magnum primers. I just ran some pressure ladders in this 35 degree C weather with a 3 different combos. 178 AH loaded to 3.650" (seated to 2nd groove) both powders showed 3200 fps as the top safe load H4831 took 80 gr to do that and IMR 4955 took only 74.5 168 Hornady BTHP loaded to 3.450 showed 76gr as the top and making 3250 fps Now I will load down until I find accuracy. Hopefully.... In my limited experience it seems that 4955 makes about the same speed as 4831 but takes a few less grains to do it and slightly lower case fill, with 4955 once I started seeing pressure signs they built rapidly where 4831 is the opposite. Seems like it will be a decent powder for the lighter bullets in 300 win mag but with heavier bullets I think I would look elsewhere. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Imr 4955 in 6mm creed?
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