Anyone have any info on temperature variation with different powders..
Example, a 243, 6mm, 257, 25-06, 270,7mm 30-06, 300's etc using Re-19-22-25 or IMR-4831 4350 etc
from a cold 20-25 deg day (what vel do you get?), on up to 60-70 deg (what vel do you get now).
I have not done enough testing myself to make anything yet, I'd like to know how ball powders compare to stick powders from 20-70 deg or something around that. have any of you have done any temperature to velocity testing?
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i think most concentrate on how much extra powder they need to get the same velocity when it's cold rather than how much slower it is.
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I do that also. This was an unintended discovery. I 'just happened' to shoot over the chrono on a very cool day for no good reason at all. I was suprised that the velocity difference was that large. Still shot good though. But needed a new drop chart for cool weather shooting. I'm not trustworthy enough to keep a load for each season. [img]/ubbthreads/images/graemlins/frown.gif[/img]
I may be the slowest guy on the mountain . . . . but . . . . I'm on the mountain!
Scott, I have numerous examples of temperature variation that I could use, but here is one example and I will look up records for others.
25/06 AI Rem Case, Fed 215 Primer, Nosler 100 grn SPBT LL 3.180 Load 60.5 grains IMR 4831
Dave, That test was done 18 years ago, when my gunsmith recommended me to use magnum primers. I still use magnum primers whenever I am using ball powders, and especially when I am using H870. However, I have been using the Rem 91/2M primer recently and that does seem to be milder than the Fed 215.
I will take up your suggestion and do a test of a standard V magnum primers in my 25/06AI, and see what the results are. Regards, Brian.