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Rifles, Reloading, Optics, Equipment
Reloading
Powder Stability.
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<blockquote data-quote="Pdvdh" data-source="post: 854959" data-attributes="member: 4191"><p>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.</p><p><u>Tract 1 is Retumbo</u> in a 7mm Rem Mag with a 168gr Berger VLD. Barrel length = 24 3/8".</p><p><u>Tract 2 is IMR 7828</u> in a 300 Win Mag with a 210gr Berger VLD. Barrel length = 25 1/2".</p><p><u>Tract 3 is H1000</u> in a 280 RCBS Improved with a 162gr Hornady Amax. Barrel length = 28".</p><p></p><p>[ATTACH=full]83300[/ATTACH] </p><p></p><p>I know the Retumbo speeded up as the temperatures dropped to freezing ~32*F. 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 Retumbo with decreasing temperatures.</p><p></p><p>Notice the big differences between the two Hodgdon Extreme powders and IMR 7828.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 854959, member: 4191"] 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. [U]Tract 1 is Retumbo[/U] in a 7mm Rem Mag with a 168gr Berger VLD. Barrel length = 24 3/8". [U]Tract 2 is IMR 7828[/U] in a 300 Win Mag with a 210gr Berger VLD. Barrel length = 25 1/2". [U]Tract 3 is H1000[/U] in a 280 RCBS Improved with a 162gr Hornady Amax. Barrel length = 28". [ATTACH=full]83300[/ATTACH] I know the Retumbo speeded up as the temperatures dropped to freezing ~32*F. 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 Retumbo with decreasing temperatures. Notice the big differences between the two Hodgdon Extreme powders and IMR 7828. [/QUOTE]
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