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Post by rockchuck on Aug 22, 2017 16:49:15 GMT -5
Anyone have an idea on the trmp sensitivity of blackhorn 209? I contacted them to ask if they had any data and they said they test all powder feom -40 yp to 120 degrees Fahrenheit and there is no more than a 3-5% velocity variance at all temp ranges. They didnt have any data charts or anything like that to show it though. I have been toying with my ballistic calculator and out at distance the temp sensitivity % can make a noticeable difference in impact. My strelok app came just set at a 1.3 factor but would like to figure out what i really should have it at.
Anyone already tread this or a similar path on temp sensitivity?
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Post by dennis on Aug 22, 2017 18:49:25 GMT -5
Check with doug136 he has used it quite a bit if I'm not mistaken.
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AJ
Full Member
Meatasarus
Posts: 182
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Post by AJ on Aug 22, 2017 20:04:38 GMT -5
I have not seen a noticeable change from 40°F to 90°F changes. The groups did not change enough to be concerned with.
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Post by doug136 on Aug 22, 2017 21:00:52 GMT -5
Out at long ranges i can see impact changes from day to day depending on temp and humidity . I think its more because of the lower velosity than the powder itself . I honestly dont think the velosity changes all that much but temp and humidity really seems to play with a slow moving bullet . Its nothing for me to be a minute or 2 off on elevation at 300 yards and beyond from 1 day to the next . For that matter from shooting in the morning and then shooting in the afternoon . I have shot over 20 lbs of Blackhorn this year alone . But with that being said Jeff Fisk (Bestill) on the board has shot much much more Blackhorn than i have . Send him a pm or he may chime in when he reads this thread.Jeff is the most knowledgeable person i know on Blackhorn .
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