Yes sir, that's why if you take two of the same cartridges and fire one in a bolt and another in a semi then the semi's brass will be hotter. Brass can be warm coming out of the bolt gun but as hot it will not be.
.300 win mag: pursuing 4000 feet per second.
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Another good example! Thanks...but I wasn't throwing a semi into the equation...
My bad, I have been the whole time.
Read a response about surface area, but remember that 5x surface area also houses 5x the powder being burned.
Albeit....my question...lmao! I still can't explain it! But it's really novel when I let a new guy fire it and have him immediately eject the casing into my hand and I put it on his bare arm! Then the question again...What the H..l replaces the look of terror!My bad, I have been the whole time.
Read a response about surface area, but remember that 5x surface area also houses 5x the powder being burned.
You also have 5X the surface area soaking up heatMy bad, I have been the whole time.
Read a response about surface area, but remember that 5x surface area also houses 5x the powder being burned.
That's a bit of an exaggeration. If you do the math on the surface area and going best case scenario with a .50 BMG action (2"x12") and being generous with a 2"x5" barrel shank and compare that to an 8"x1.35" Remington short action and use 1.2"x5" barrel shank as comparison, it is actually right at double the surface area.
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I said 5X as that was the example you used
Sure did, I stand corrected…by myself.
So that makes it even worse, 2x the surface area for 4-5x the powder burned. Should that absorb or dissipate heat any faster than an action/chamber/barrel tenon half its size and a fraction of its powered capacity?
So that makes it even worse, 2x the surface area for 4-5x the powder burned. Should that absorb or dissipate heat any faster than an action/chamber/barrel tenon half its size and a fraction of its powered capacity?
Ok
). Thanks for effort folks!
..
Okay...I opened the can of worms...allow me to close it...mystery unsolved...I will bring the question back in 5 years as a COLD CASE..( Pun intended..Sure did, I stand corrected…by myself.
). Thanks for effort folks!..
Okay, one last thought. Maybe it has something to do with the difference in the burn rates and heat of explosion characteristics of the different powders involved?
50 BMG powders are some of the slowest in the world. On the other hand, .223 are some very fast powders. Everything else is a gradual slowing down to 50 BMG. Seems to me like maybe faster, hotter powders would glow hotter and like a torch turned way up and the brass is unable to dissipate the heat generated fast enough from that instanateous burst of energy so that it is cool to the touch. On the other hand, 50 BMG is burning tar that takes longer to burn but maybe doesn't burn as hot and maybe the brass can dissipate the heat about as fast as it gets transferred from the explosion? But longer slower burn is more gentle on the brass,
and more gentle on your hand. That is the only explanation I can think of that makes sense to me.
There has to be some correlation of absolute mass of powder per unit of volume that compensates to some extent for the
.50 cal shell size vs. its higher powder charge so that its a ratio thing. It can't be the whole answer to me. So, I'm guessing the only other difference is the type and burn rate and energy release rate of the powders themselves?? Maybe I'm groping in the dark
but it makes some sense to me.
We need a lab to run this skin burn test under controlled conditions......who wants to hold on to the brass from each test??
50 BMG powders are some of the slowest in the world. On the other hand, .223 are some very fast powders. Everything else is a gradual slowing down to 50 BMG. Seems to me like maybe faster, hotter powders would glow hotter and like a torch turned way up and the brass is unable to dissipate the heat generated fast enough from that instanateous burst of energy so that it is cool to the touch. On the other hand, 50 BMG is burning tar that takes longer to burn but maybe doesn't burn as hot and maybe the brass can dissipate the heat about as fast as it gets transferred from the explosion? But longer slower burn is more gentle on the brass,
and more gentle on your hand. That is the only explanation I can think of that makes sense to me.
There has to be some correlation of absolute mass of powder per unit of volume that compensates to some extent for the
.50 cal shell size vs. its higher powder charge so that its a ratio thing. It can't be the whole answer to me. So, I'm guessing the only other difference is the type and burn rate and energy release rate of the powders themselves?? Maybe I'm groping in the dark
but it makes some sense to me.
We need a lab to run this skin burn test under controlled conditions......who wants to hold on to the brass from each test??
Faster burning powders make more heat than slower burning powders, 50 grains of H1000 burns at the same temp as 100 grains ( relative to case capacity) it just doesn't create as much pressure, multiply that by 4X the surface area exposed to the open air as you are not accounting for the added material throughout the entire weapon required those pressures and you have a very efficient heat sinkSure did, I stand corrected…by myself.
Already have...that's why the questionOkay, one last thought. Maybe it has something to do with the difference in the burn rates and heat of explosion characteristics of the different powders involved?
50 BMG powders are some of the slowest in the world. On the other hand, .223 are some very fast powders. Everything else is a gradual slowing down to 50 BMG. Seems to me like maybe faster, hotter powders would glow hotter and like a torch turned way up and the brass is unable to dissipate the heat generated fast enough from that instanateous burst of energy so that it is cool to the touch. On the other hand, 50 BMG is burning tar that takes longer to burn but maybe doesn't burn as hot and maybe the brass can dissipate the heat about as fast as it gets transferred from the explosion? But longer slower burn is more gentle on the brass,
and more gentle on your hand. That is the only explanation I can think of that makes sense to me.
There has to be some correlation of absolute mass of powder per unit of volume that compensates to some extent for the
.50 cal shell size vs. its higher powder charge so that its a ratio thing. It can't be the whole answer to me. So, I'm guessing the only other difference is the type and burn rate and energy release rate of the powders themselves?? Maybe I'm groping in the dark
but it makes some sense to me.
We need a lab to run this skin burn test under controlled conditions......who wants to hold on to the brass from each test??
^^^^^^^^^^^^^^^^^^^^^ Yep^^^^^^^^^^^^^^^^Okay, one last thought. Maybe it has something to do with the difference in the burn rates and heat of explosion characteristics of the different powders involved?
50 BMG powders are some of the slowest in the world. On the other hand, .223 are some very fast powders. Everything else is a gradual slowing down to 50 BMG. Seems to me like maybe faster, hotter powders would glow hotter and like a torch turned way up and the brass is unable to dissipate the heat generated fast enough from that instanateous burst of energy so that it is cool to the touch. On the other hand, 50 BMG is burning tar that takes longer to burn but maybe doesn't burn as hot and maybe the brass can dissipate the heat about as fast as it gets transferred from the explosion? But longer slower burn is more gentle on the brass,
and more gentle on your hand. That is the only explanation I can think of that makes sense to me.
There has to be some correlation of absolute mass of powder per unit of volume that compensates to some extent for the
.50 cal shell size vs. its higher powder charge so that its a ratio thing. It can't be the whole answer to me. So, I'm guessing the only other difference is the type and burn rate and energy release rate of the powders themselves?? Maybe I'm groping in the dark
but it makes some sense to me.
We need a lab to run this skin burn test under controlled conditions......who wants to hold on to the brass from each test??
Okay...we have the heat sink figured...now...what about my 50 cal? ( sorry Bean...had to do it!) No reply necessary
