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Posted: 6/24/2013 7:43:20 AM EDT
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Had my Remington 700 300BO out to the range with my latest batch of Barnes 110gr TacTx and 19.5gr of H110 (great load btw). I noticed the lack of heat on the spent casings. I could eject them into my hand and they were barely warm.
I know my 223 comes out hot to the touch. I got blisters from a 22lr spent case that got stuck in my collar two days ago. Why not the 300BO? Barrel was plenty warm. |
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Some powders burn hotter than others, but I know what you're getting at. I reload and I have/use 30 different powders here and sometimes when I'm shooting, say my 22-250, with a certain powder, I'll notice that they're not coming out hot and other times, say with my 223 ARs, they are hot.
Heat sinking has nothing to do with it, IMO, as I don't leave things in that long and even getting up and picking AR-15 brass off the concrete 10' away, they're still quite toasty. It's gotta be the powder's energy density and burn rate. Slower powders will take longer to burn through, so temps can get hotter than quicker powders, blowing their fuse in short order. Chris |
| Sounds like you are comparing semi auto spent brass to bolt action spent brass. In semi auto the dwell time in chamber is very minimal so the heat transfer in to the barrel is reduced, brass will always be hot. In a bolt action the dwell time transfers heat and will almost always be cool enough to handle. |
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