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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
Hodgdon Varget .223 - Temperature Sensitive?
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<blockquote data-quote="Pdvdh" data-source="post: 1130012" data-attributes="member: 4191"><p>I know Hodgdon advertises Varget in their Extreme line of powders, which is supposed to help minimize temperature sensitivity.</p><p></p><p>I've chronographed Hornady 60gr Vmax bullets using 26-26.9gr Varget out of my AR-15 M4 carbine. Reviewing my MV data, I'm seeing pretty strong evidence of a 60fps increase in MV between 40F and 65F. That's on the order of 2.5 fps per degree F.</p><p></p><p>I don't have much experience with the .223 cartridge. Are the smaller cartridges more prone to temperature caused changes in MV than larger cartridges? I don't see similar temperature swings causing anywhere near this rate on MV with two other Hodgdon Extreme powders - H1000 and Retumbo. But these two powders are used in 7mm RM and 300 WM capacity/size cartridges.</p><p></p><p>Anyone with experience using Varget for the .223 seeing similar temperature affects on MV? I've recorded enough MVs to be pretty certain about this, but if others aren't experiencing this, I've record some additional MV data at some additional temperatures.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1130012, member: 4191"] I know Hodgdon advertises Varget in their Extreme line of powders, which is supposed to help minimize temperature sensitivity. I've chronographed Hornady 60gr Vmax bullets using 26-26.9gr Varget out of my AR-15 M4 carbine. Reviewing my MV data, I'm seeing pretty strong evidence of a 60fps increase in MV between 40F and 65F. That's on the order of 2.5 fps per degree F. I don't have much experience with the .223 cartridge. Are the smaller cartridges more prone to temperature caused changes in MV than larger cartridges? I don't see similar temperature swings causing anywhere near this rate on MV with two other Hodgdon Extreme powders - H1000 and Retumbo. But these two powders are used in 7mm RM and 300 WM capacity/size cartridges. Anyone with experience using Varget for the .223 seeing similar temperature affects on MV? I've recorded enough MVs to be pretty certain about this, but if others aren't experiencing this, I've record some additional MV data at some additional temperatures. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
Hodgdon Varget .223 - Temperature Sensitive?
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