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temp stability of powder

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Poll Question: What is best bet for 3100+ fps with 180gr. bullet in .300 wby
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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/14/2009 at 18:14
trigger29 View Drop Down
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X = 180 Y = 90 (X+Pyro)+(Y-Pyro) = ?

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I'm looking for a powder for my .300 wby to get me 3100 plus fps from a 180 gr. bullet that will be fairly temperature insensative between 10-80 degrees, and provide reasonable accuracy. I would kind of like to avoid compressed loads, as I've heard they can cause runout. What do you think is the best bet?

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/14/2009 at 18:32
Roy Finn View Drop Down
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I had a 30 STW (30-8mm Rem Mag) which is basically identical to the 300 Roy and my powder choice was IMR7828 (84-85 grs) with 180's.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/14/2009 at 18:33
Mike McDonald View Drop Down
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If you're looking for temp stability 1st understand it's not an absolute.
All powders respond to temp changes.  All powders have a knee in the response curve somewhere around + 40-50 degrees F.  How steep that knee is bent depends on the powder.
Then rule out all things IMR and Alliant.
Worst offender is going to be the VV series powders.
Hodgdons offers the best of what you seek.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/14/2009 at 18:42
Roy Finn View Drop Down
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Another powder that is supposed to be fairly temp insensitive is the line of RamShot powders. I have not used them, Mike, but I know that Barsness has quite a bit and he apparently likes em. Maybe he'll chime in as well.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/14/2009 at 19:36
Blackbird View Drop Down
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I don't load for any magnum cartridges, so this may be meaningless, but Hodgdon's Extreme powders are the powder of choice for many competitive target shooters who shoot year round, in Pennsylvania.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/14/2009 at 19:46
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IMR7828SSC and Fed 215 is the powder I found to produce the velocities it said it would in the manual.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/14/2009 at 20:16
lucytuma View Drop Down
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I also use 7828ssc, but I agree that h1000 is probably the least temp. sensative.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/15/2009 at 06:39
pyro6999 View Drop Down
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i shoot h-1000 in my .264 and 7828 in my 6.5rem mag.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/15/2009 at 18:11
trigger29 View Drop Down
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X = 180 Y = 90 (X+Pyro)+(Y-Pyro) = ?

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We seem to be coming down to the two powders that I had pretty much settled on. 7828 gives great velocity, but being a yank up here in the north, I can't ignore temperature changes. I'll start with the 7828, and if it holds accuracy through different temps great. If not I'll try the H-1000
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