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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Unburned Powder in Big Cases, Right?
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<blockquote data-quote="LouBoyd" data-source="post: 277001" data-attributes="member: 9253"><p>Have you ever considered the actual life of a high power rifle barrel. I'll use the 7mm STW with a 26" barrel as an example with a 180 gn bullet at 3000 fps. If you allow that it will give 1000 useful shots thats only a lifetime of 1.27 seconds. The time the bullet is in the bore per shot is only 1.27 milliseconds. </p><p></p><p>Shooting high performace rifles is hard on bores. I really coiuld care less whether all of the powder burns or not. What matters is the pressure curve which is generated. </p><p>Desirable pressure curves</p><p>1. achieve a desired muzzle velocity.</p><p>2. don't exceed rated chamber pressure,</p><p>3. give repeatable burn rates resulting in low velocity spread. That usually means case fills in the 95 to 100% range. </p><p>4. as a tie breaker give lower muzzle pressure than other loads. </p><p></p><p>Nohwere on that list is long barrel life. </p><p></p><p>If I want more barrel live I choose a smaller capacity cartridge.</p><p>I consider 1000 shots, maybe even 500 reasonable life in a hunting rifle barrel. I'd prefer 5000 in a target rifle which I shoot a lot. Barrels however are an expendable item. They rarely cost more than the ammo it takes to burn them out so they're not the major cost of shooting.</p></blockquote><p></p>
[QUOTE="LouBoyd, post: 277001, member: 9253"] Have you ever considered the actual life of a high power rifle barrel. I'll use the 7mm STW with a 26" barrel as an example with a 180 gn bullet at 3000 fps. If you allow that it will give 1000 useful shots thats only a lifetime of 1.27 seconds. The time the bullet is in the bore per shot is only 1.27 milliseconds. Shooting high performace rifles is hard on bores. I really coiuld care less whether all of the powder burns or not. What matters is the pressure curve which is generated. Desirable pressure curves 1. achieve a desired muzzle velocity. 2. don't exceed rated chamber pressure, 3. give repeatable burn rates resulting in low velocity spread. That usually means case fills in the 95 to 100% range. 4. as a tie breaker give lower muzzle pressure than other loads. Nohwere on that list is long barrel life. If I want more barrel live I choose a smaller capacity cartridge. I consider 1000 shots, maybe even 500 reasonable life in a hunting rifle barrel. I'd prefer 5000 in a target rifle which I shoot a lot. Barrels however are an expendable item. They rarely cost more than the ammo it takes to burn them out so they're not the major cost of shooting. [/QUOTE]
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Unburned Powder in Big Cases, Right?
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