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Temperture Sensitive Powders??
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At what temperture do powders start to deviate? I shot some of my .223 reloads with W748 27.5 grns/450 primer yesterday and the group opened up by 1" at 100yds. Same reloads two weeks ago shot .5 at 100yds and the temp was 70 yesterday and maybe 52-55 two weeks ago. H.H.
 
Posts: 161 | Location: hoosierville | Registered: 02 April 2003Reply With Quote
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All powders are different as far as how temp effects them. Typically, the ball powders are more sensitive than others. I had to change the powder in my 22-250 for the same reason. I was shooting H380, which gave me great groups at 40-50 degrees, but opened up considerably above that. I switched to IMR4895 which seems to handle the temp ranges much better and still produces great groups. Never tried them, but I hear the Hodgdon Extreme powders do very well over a very wide range of temps.
 
Posts: 445 | Location: Connellsville, PA | Registered: 25 April 2002Reply With Quote
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ADI powders are reputed to be very stable and now Hodgson are using some.
 
Posts: 336 | Location: Toowoomba, Queensland, Australia | Registered: 09 March 2001Reply With Quote
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Hodgdon powders that have the small label "EXTREME" on them are very temperature insensitive. I may stand corrected, but I believe that their testing a few short years ago indicated that the variation in velocity was eight'/sec from 125 down to zero degrees Fahenheit. Their ball powders are not included in this catagory, only their extruded powders. Mike
 
Posts: 21 | Location: Missoula, Montana 59802 | Registered: 28 May 2003Reply With Quote
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Most of the ball type powders are sensitive to temps, more so than the extruded types. If you want a more stable powder then consider the Hodgodon Extreme line or the Ramshot powders from Montana. MtnHtr
 
Posts: 254 | Location: USA | Registered: 30 May 2002Reply With Quote
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