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Posted: 9/8/2012 7:26:38 AM EDT
| Would it benefit testing data to measure barrel temp of each shot? Does anyone do this? Just pulled out an IR thermometer at work and got to thinking about checking the temp of barrel at each shot. Wondering if it would help reduce the temp of barrel variable when working up loads. I already record the air temp of the day I am shooting so I can go back at look at my records. |
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Would it benefit testing data to measure barrel temp of each shot? Does anyone do this? Just pulled out an IR thermometer at work and got to thinking about checking the temp of barrel at each shot. Wondering if it would help reduce the temp of barrel variable when working up loads. I already record the air temp of the day I am shooting so I can go back at look at my records. Surface temp is not interior temp, and do not forget to correct for emissivity of the surface material you are measuring. |
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Would it benefit testing data to measure barrel temp of each shot? Does anyone do this? Just pulled out an IR thermometer at work and got to thinking about checking the temp of barrel at each shot. Wondering if it would help reduce the temp of barrel variable when working up loads. I already record the air temp of the day I am shooting so I can go back at look at my records. Surface temp is not interior temp, and do not forget to correct for emissivity of the surface material you are measuring. With an IR you could open the bolt and measure the barrel around the lands. Not familiar with correcting emissivity... If you measure the same spot on the outside of barrel for all your data, would that not tell you anything? I know it is external temp but hear me out. I shoot 5 shots and my barrel gets to X deg F. On the 6th shot it gets to Y deg F. I measure the temp of barrel until it gets back to X and shoot again. For each shot after this I wait until it gets back to X deg F. Everyone says to wait the same amount of time between shots when testing, but with each subsequent shot the barrel temps gets higher and higher and can't cool down to the same temp. |
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Im not sure how much benefit you would gain from the info other than knowing how long to allow the barrel to cool after a shot string or maybe plot how the barrel moves with temperature.
Outside of range duty and competition, most shots will be considered cold bore. just remember to put a fouler or two down the barrel before getting serious. |
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Nothing wrong with your idea.
Keeping track of the bbl and chamber temp as part of learning the effects is a good lesson. Some sports require rapid strings or involve the possibility that shooting tempo adds the temperature dimension to your purpose. Varmint hunters learn not to cook rounds in hot chambers. Hunters learn the difference between cold bore shots, foulers, and range testing. It is good that you are thinking ahead. The important thing is to learn how to investigate and test realistically if you can. |
| Factory barrels can walk as they heat, this is where watching the temperature may help. If the brass is ejected right away, a lot of heat comes with it. Photo Albums |
| Gun is a Savage LRPV .223 with 26" stainless steel barrel that is 1" thick. I can shoot a lot of rounds before I notice adverse effects of heat...I was just curious if anyone tracks temp in load development but it seems no one does. Prolly helps to track the air temp and humidity more than it would be to track barrel temp (easier too). |
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Gun is a Savage LRPV .223 with 26" stainless steel barrel that is 1" thick. I can shoot a lot of rounds before I notice adverse effects of heat...I was just curious if anyone tracks temp in load development but it seems no one does. Prolly helps to track the air temp and humidity more than it would be to track barrel temp (easier too). I got a few 'good' barrels that I had cryo treated. They do NOT experience the same level of stringing as they heat up as compared to barrels of similar length shooting the same ammo that were untreated... Hardly noticeable with the cryo treated barrels. You can see this first hand when you are testing at the range. POI is going to change as you heat the piss out of an untreated barrel. 
FWIW - The cryo barrels do not tend to foul as easily either. I have taken two rifles with 16" barrels to the range and shot the same exact ammo in each and shot each the same number of rounds (200 rnds each IIRC). One barrel was treated and the other not... The cryo barrel only needed 1/2 the number of patches to clean afterwards... The pistols that I shoot a LOT - I sent the barrels out to have them treated. Not because I am such a great shot that I 'needed' the extra little bit of accuracy as they heated up - I am nowhere near that good and likely never will be... I sent them out to be done because of the reduced fouling that I noticed in rifle barrels. 
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Quoted:
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Gun is a Savage LRPV .223 with 26" stainless steel barrel that is 1" thick. I can shoot a lot of rounds before I notice adverse effects of heat...I was just curious if anyone tracks temp in load development but it seems no one does. Prolly helps to track the air temp and humidity more than it would be to track barrel temp (easier too). I got a few 'good' barrels that I had cryo treated. They do NOT experience the same level of stringing as they heat up as compared to barrels of similar length shooting the same ammo that were untreated... Hardly noticeable with the cryo treated barrels. You can see this first hand when you are testing at the range. POI is going to change as you heat the piss out of an untreated barrel. http://i1017.photobucket.com/albums/af296/mississippiguy37/707dfbbf.jpg FWIW - The cryo barrels do not tend to foul as easily either. I have taken two rifles with 16" barrels to the range and shot the same exact ammo in each and shot each the same number of rounds (200 rnds each IIRC). One barrel was treated and the other not... The cryo barrel only needed 1/2 the number of patches to clean afterwards... The pistols that I shoot a LOT - I sent the barrels out to have them treated. Not because I am such a great shot that I 'needed' the extra little bit of accuracy as they heated up - I am nowhere near that good and likely never will be... I sent them out to be done because of the reduced fouling that I noticed in rifle barrels. What does that run price wise for a rifle barrel? |
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[span style='font-weight: bold;']Originally Posted By TXN_Infidel
What does that run price wise for a rifle barrel? Depends on what company you choose to do the work. The place I use is $49.50 for a rifle barrel or $35.00 for a pistol barrel. They do small parts as well and charge by the pound for stuff like that. |
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Nothing wrong with your idea. Keeping track of the bbl and chamber temp as part of learning the effects is a good lesson. Some sports require rapid strings or involve the possibility that shooting tempo adds the temperature dimension to your purpose. Varmint hunters learn not to cook rounds in hot chambers. Hunters learn the difference between cold bore shots, foulers, and range testing. It is good that you are thinking ahead. The important thing is to learn how to investigate and test realistically if you can. +1 |
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Not familiar with correcting emissivity...
Different surface clors alter theamout of IR at any partualt temeratre The curve is not straight with temperature, so even delta measurement can be thrown off. Black is most efficient, bare polished metal the least. When we need accurate measurements we use a thermocouple beside a marked 'reading spot' and then adjust the IR meter to match the thermocouple. For larger temperature swigs you do it at a couple temperature points so yuo can adjust the IR meter readings. |
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Quoted:
Not familiar with correcting emissivity...
Different surface clors alter theamout of IR at any partualt temeratre The curve is not straight with temperature, so even delta measurement can be thrown off. Black is most efficient, bare polished metal the least. When we need accurate measurements we use a thermocouple beside a marked 'reading spot' and then adjust the IR meter to match the thermocouple. For larger temperature swigs you do it at a couple temperature points so yuo can adjust the IR meter readings. That makes sense to me now. Would not have thought of that.... |
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