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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
What kills barrel life on bigger magnums?
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<blockquote data-quote="Kennibear" data-source="post: 891733" data-attributes="member: 51650"><p>When fiftydriver speaks I tend to listen. Hard to argue with somebody who does this everyday.</p><p>Not too many years ago I was heavily into Title II stuff and you could burn out a barrel throat in a few minutes of pouring ammo through a machinegun. If you loaded up about 500rnds in mags and fed them one after another the barrel would glow. After cleaning it up an inspection of the throat showed it was shot out for anything other than ventilating hillsides and barns. Provided the barn wasn't too far away.</p><p></p><p>I've known about heating up a barrel for quite some time but there wasn't much you could do but wait it out. No fun just to sit still at the bench. Read about a wand hooked to a CO2 tank and blown through the barrel but it was so fast I wonder if it shocks the barrel, i.e. quenches it.</p><p>[ATTACH]29092[/ATTACH]</p><p></p><p>This is a barrel cooler my son and I built. Scrap PC fans @ $1 each (3) and a 12 volt gel cell from a computer UPS backup also sold @ the box stores for alarm systems for $25 new. The big hose is a dishwasher hose, same source. The small hose is scrap from the garage and fits the bolt size pretty close (about 5/8"). Two of the fans are stacked and feed the forward chamber. The third fan forms the third stage and pushed the pressurized air from that chamber into the hose. You need to build some pressure not just volume because your going to push the air down a rifle bore, hence the three stages.</p><p>It sits on the ground under the bench and we open the bolt to extract the fired round and push the small tube into the chamber and flick the switch. With 45 seconds of run time we keep a barrel that starts at 85F under 100F for five shots. This is for something like a 300 WinMag or 375 Ruger. There is a K type bead thermometer taped to the barrel over the chamber to track it. The air is filtered by a piece of 3M Scotchbrite pad cut to fit the back of the box.</p><p></p><p>You can watch the temp fall when you turn on the switch. Keeps the barrels cool and our investment in the guns from heading toward the target in the form of vaporized steel. It lets us test a lot more ammo in the course of a day at the range so it has paid for itself in that alone. </p><p></p><p>Some people may laugh... but I've got one and they don't!</p><p></p><p>KB</p></blockquote><p></p>
[QUOTE="Kennibear, post: 891733, member: 51650"] When fiftydriver speaks I tend to listen. Hard to argue with somebody who does this everyday. Not too many years ago I was heavily into Title II stuff and you could burn out a barrel throat in a few minutes of pouring ammo through a machinegun. If you loaded up about 500rnds in mags and fed them one after another the barrel would glow. After cleaning it up an inspection of the throat showed it was shot out for anything other than ventilating hillsides and barns. Provided the barn wasn't too far away. I've known about heating up a barrel for quite some time but there wasn't much you could do but wait it out. No fun just to sit still at the bench. Read about a wand hooked to a CO2 tank and blown through the barrel but it was so fast I wonder if it shocks the barrel, i.e. quenches it. [ATTACH]29092.vB[/ATTACH] This is a barrel cooler my son and I built. Scrap PC fans @ $1 each (3) and a 12 volt gel cell from a computer UPS backup also sold @ the box stores for alarm systems for $25 new. The big hose is a dishwasher hose, same source. The small hose is scrap from the garage and fits the bolt size pretty close (about 5/8"). Two of the fans are stacked and feed the forward chamber. The third fan forms the third stage and pushed the pressurized air from that chamber into the hose. You need to build some pressure not just volume because your going to push the air down a rifle bore, hence the three stages. It sits on the ground under the bench and we open the bolt to extract the fired round and push the small tube into the chamber and flick the switch. With 45 seconds of run time we keep a barrel that starts at 85F under 100F for five shots. This is for something like a 300 WinMag or 375 Ruger. There is a K type bead thermometer taped to the barrel over the chamber to track it. The air is filtered by a piece of 3M Scotchbrite pad cut to fit the back of the box. You can watch the temp fall when you turn on the switch. Keeps the barrels cool and our investment in the guns from heading toward the target in the form of vaporized steel. It lets us test a lot more ammo in the course of a day at the range so it has paid for itself in that alone. Some people may laugh... but I've got one and they don't! KB [/QUOTE]
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What kills barrel life on bigger magnums?
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