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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
High Velocity Throat Erosion
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<blockquote data-quote="arch408" data-source="post: 2585253" data-attributes="member: 59036"><p>I kinda agree with Calvin45 about borescopes. Sometimes I wish i never had one. Sometimes ignorance is bliss. If the rifle is getting acceptable accuracy, leave it alone. I have a 6.5 Rem Mag that I bought used about 1978, so I don't know the it's history. I used it many years deer hunting. It wasn't a 1/2" rifle, but I managed to kill 3 deer with it at 350 to 400 yards. My closest was about 10 yards. I caught a lot of flack from most hunters because they thought that it was too "small". It never failed me, and every deer I killed only took one shot. It is still an accurate rifle. A few years ago, I bought a bore scope and checked it out. The bore is eroded and has fire cracks in the first inch and a half or so. It also has a land that has copper fouling for several inches. But any way, I think that throat erosion is strictly due to heat. Friction cannot be a big issue because the bullet is traveling way faster at the muzzle and it has no erosion. Every time you fire the rifle, you have a blow torch in the first part barrel under tremendous pressure. The temperature is much higher then the melting point of steel, but it doesn't last long enough to do much damage. If you don't let your barrel cool down between shots, the barrel will erode faster because the steel is closer to it's melting temp. Larger cases have more powder, there fore they have more fuel and more time to heat up the barrel. Also Boyles Law (P1/T1=P2/T2) dictates that anytime you change the temperature or pressure of a gas, you get a coresponding change. IE, when the breech pressure builds to peak, you get a tremendous increase in heat and heat melts or burns up steel.</p></blockquote><p></p>
[QUOTE="arch408, post: 2585253, member: 59036"] I kinda agree with Calvin45 about borescopes. Sometimes I wish i never had one. Sometimes ignorance is bliss. If the rifle is getting acceptable accuracy, leave it alone. I have a 6.5 Rem Mag that I bought used about 1978, so I don’t know the it’s history. I used it many years deer hunting. It wasn’t a 1/2” rifle, but I managed to kill 3 deer with it at 350 to 400 yards. My closest was about 10 yards. I caught a lot of flack from most hunters because they thought that it was too “small”. It never failed me, and every deer I killed only took one shot. It is still an accurate rifle. A few years ago, I bought a bore scope and checked it out. The bore is eroded and has fire cracks in the first inch and a half or so. It also has a land that has copper fouling for several inches. But any way, I think that throat erosion is strictly due to heat. Friction cannot be a big issue because the bullet is traveling way faster at the muzzle and it has no erosion. Every time you fire the rifle, you have a blow torch in the first part barrel under tremendous pressure. The temperature is much higher then the melting point of steel, but it doesn’t last long enough to do much damage. If you don’t let your barrel cool down between shots, the barrel will erode faster because the steel is closer to it‘s melting temp. Larger cases have more powder, there fore they have more fuel and more time to heat up the barrel. Also Boyles Law (P1/T1=P2/T2) dictates that anytime you change the temperature or pressure of a gas, you get a coresponding change. IE, when the breech pressure builds to peak, you get a tremendous increase in heat and heat melts or burns up steel. [/QUOTE]
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High Velocity Throat Erosion
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