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Reloading Techniques For Reloading


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Powder Stability.

 
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  #8  
Old 09-22-2013, 12:09 PM
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Re: Powder Stability.

The pattern I've noted with all powders, is that the numbers get the tighest with high load densities and a hotter ignition. In your case with the 308 and 175s, if you are running 42 or so grns of AR comp and 43.5grns or so of Varget, both with CCI BR2s your temp spread as well as possibly your extreme spread will likely tighten up with 43+ grns of AR Comp and 45+ grns of Varget with Fed210Ms or even more so with WLR primers.
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  #9  
Old 09-22-2013, 06:13 PM
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Re: Powder Stability.

Here's three powders in three different cartridges. Velocity was recorded over duplicate chronographs (Oehler 33 & Pact PC2) or triplicate chronographs (Oehler 33 & Pact PC2 & Oehler 35P) run concurrently with each bullet fired.
Tract 1 is Retumbo in a 7mm Rem Mag with a 168gr Berger VLD. Barrel length = 24 3/8".
Tract 2 is IMR 7828 in a 300 Win Mag with a 210gr Berger VLD. Barrel length = 25 1/2".
Tract 3 is H1000 in a 280 RCBS Improved with a 162gr Hornady Amax. Barrel length = 28".



I know the H1000 speeded up as the temperatures dropped. Don't ask me why. Best I can figure is they've treated the Hodgdon Extreme powders to increase burn rate as temperatures fall. In this case MV increased with this lot of H1000 with decreasing temperatures.

Notice the big differences between the two Hodgdon Extreme powders and IMR 7828.
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  #10  
Old 09-22-2013, 06:41 PM
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Re: Powder Stability.

That's good info, the Retumbo is almost spot on with my results, and the 7828 is close, that is weird with the H1000 though, but they have had a few mixed up batches of Varget, H1000, and Retumbo.
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