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Rifles, Reloading, Optics, Equipment
Reloading
IMR 4831 Go to powder for what?
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<blockquote data-quote="Mike Matteson" data-source="post: 2963725" data-attributes="member: 101791"><p>I haven't used IMR Powders a long time ago. About took a bolt action apart. Below the primer out of the case. Learn shortly thereafter that IMR 4831 changes as much as 1.01fps in temp change. So now where are you at? In the info that I have come up with. 30fps variation in your bullet drops. Changes POI by 8.5" @ 1000yds. A 50fps changes the POI by 14" @ 1000yds. That is also on what powders used. Now H4831 the fps changes .08 per degree H4350 changes about .032 per degree. So now H4350 changes about 1.6" @ 1000yds in 50dr weather change, and H4831 changes about 4" with the same temp change. 50 dr isn't much in weather change. </p><p>Now I did get better velocity in IMR 4831 and IMR 4350 by about 100fps. I did get great 5 shot grouping with the IMR powder and like wises with the H powders. </p><p>Now back to the temp powders: H4381 in 125dr weather change is 10" and H3450 is 4" @ 1000yds. Now back to IMR 4831 in weather change of 125dr means as much 123". Split that in half @ 1000yds that 61.5". That is by using the means of temp. Change that into 500yds turns into about 30.75". This is using Extreme Rifle Powders Chart by Hodgdon Powders. I supplied the math to show the difference in change in POI just to Weather. That doesn't put all the rest that is needed to make a long shot. </p><p>I am not really up on programs that may do the work for you.</p></blockquote><p></p>
[QUOTE="Mike Matteson, post: 2963725, member: 101791"] I haven't used IMR Powders a long time ago. About took a bolt action apart. Below the primer out of the case. Learn shortly thereafter that IMR 4831 changes as much as 1.01fps in temp change. So now where are you at? In the info that I have come up with. 30fps variation in your bullet drops. Changes POI by 8.5" @ 1000yds. A 50fps changes the POI by 14" @ 1000yds. That is also on what powders used. Now H4831 the fps changes .08 per degree H4350 changes about .032 per degree. So now H4350 changes about 1.6" @ 1000yds in 50dr weather change, and H4831 changes about 4" with the same temp change. 50 dr isn't much in weather change. Now I did get better velocity in IMR 4831 and IMR 4350 by about 100fps. I did get great 5 shot grouping with the IMR powder and like wises with the H powders. Now back to the temp powders: H4381 in 125dr weather change is 10" and H3450 is 4" @ 1000yds. Now back to IMR 4831 in weather change of 125dr means as much 123". Split that in half @ 1000yds that 61.5". That is by using the means of temp. Change that into 500yds turns into about 30.75". This is using Extreme Rifle Powders Chart by Hodgdon Powders. I supplied the math to show the difference in change in POI just to Weather. That doesn't put all the rest that is needed to make a long shot. I am not really up on programs that may do the work for you. [/QUOTE]
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Reloading
IMR 4831 Go to powder for what?
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