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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.277,140gr 3000fps+ in a 16" bbl @ 80000psi
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<blockquote data-quote="J E Custom" data-source="post: 1832325" data-attributes="member: 2736"><p>There are plenty of actions that will handle the pressure. But there are many other problems that will crop up at those pressures. Velocity is not an issue on something like this, But throat erosion and heat cracking/ checking will be.</p><p></p><p>One of the things that I noticed with the high pressure loading's was the throat erosion and the need to set the chamber back after only a few hundred rounds to regain accuracy. this was the main reason I purchased a bore scope so I could see/follow the progress of erosion in the throat.</p><p></p><p>In these experimental loading's, I found chambers/throats lasted only 2 or 3 hundred rounds but the bore remained good for 12 to 1500 rounds before it was used up. When I backed off the pressure (From 75,000 to 65,000 I noticed a huge difference if throat life. When I went to 63,000 Psi max, the chambers and throats performed normally and life was restored to thousands of rounds. that Is when I decided to stay below 63,000 by going to more slow burning powder and larger case capacity to get the desired velocity.</p><p></p><p>The extra powder cost a little more but was cheaper in the long run by saving components, barrels and actions. The use of more efficient case designs also aided in this improvement.</p><p></p><p>Buy or build what you want and live with your decision as I did. One of the advantages of age is that you don't make the same mistake twice. (I had not listened to my own advice and it took several times to figure out that Pressure is the enemy of longevity.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1832325, member: 2736"] There are plenty of actions that will handle the pressure. But there are many other problems that will crop up at those pressures. Velocity is not an issue on something like this, But throat erosion and heat cracking/ checking will be. One of the things that I noticed with the high pressure loading's was the throat erosion and the need to set the chamber back after only a few hundred rounds to regain accuracy. this was the main reason I purchased a bore scope so I could see/follow the progress of erosion in the throat. In these experimental loading's, I found chambers/throats lasted only 2 or 3 hundred rounds but the bore remained good for 12 to 1500 rounds before it was used up. When I backed off the pressure (From 75,000 to 65,000 I noticed a huge difference if throat life. When I went to 63,000 Psi max, the chambers and throats performed normally and life was restored to thousands of rounds. that Is when I decided to stay below 63,000 by going to more slow burning powder and larger case capacity to get the desired velocity. The extra powder cost a little more but was cheaper in the long run by saving components, barrels and actions. The use of more efficient case designs also aided in this improvement. Buy or build what you want and live with your decision as I did. One of the advantages of age is that you don't make the same mistake twice. (I had not listened to my own advice and it took several times to figure out that Pressure is the enemy of longevity. J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.277,140gr 3000fps+ in a 16" bbl @ 80000psi
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