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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
The .338 Rogue
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<blockquote data-quote="Pdvdh" data-source="post: 1215321" data-attributes="member: 4191"><p>Thanks Steve. I don't always measure case head expansion. But when I'm working up loads in a new rifle/cartridge in the effort to ID a maximum pressure load, I normally do. A quality dial caliper doesn't fail, when all other indicators can. If the case heads expand 0.0005" or more, I know that's about it.</p><p></p><p>With my case, I've just learned that 107gr of RL 33 is ~100% load density when I jam bullets into the lands 0.012". I tried loading 108.5gr RL 33 with a 0.020" jump, rather than the 0.012" jam, and the bullets won't hold in the necks due to powder compression resistance. I can begin to hear and feel a little powder compression at 107.5gr RL 33 with bullets seated for a 0.012" jam.</p><p> </p><p>Greg Duley measured 65,000 psi pressure with 107.5gr RL 33 in his Lapua Improved, with a MV of 2980fps. Your's will probably pressure out similarly if you use RL 33, as Duley stated his Lapua Improved chamber was blow out to the max.</p><p></p><p>Duley also loaded up to 70,000 psi pressure using RL 33 in his rifles, with a MV of 3,020fps. He'll run stronger custom actions up to 70,000 psi pressures. But he didn't share the powder charge for his 70,000psi loading.</p><p></p><p>Greg Duley's loading data with measured pressures. Greg loves RL 33. I want to note that my improved version has a bit less volume capacity than Greg's, and <u>his top powder charge loads generate a little too much pressure</u> in my 338 Rogue chamber/cartridge. So reader/user be aware. Work up to maximum powder charge in your rifle in a safe manner.</p><p>[ATTACH=full]88416[/ATTACH]</p><p></p><p>My chamber design is able to fully utilize RL 33 at 100% load density, and reach maximum chamber pressures with the bullets jammed 0.012". I can also seat a little deeper and jump the bullets 0.020" without excessive powder compression with a 107.5gr charge of Rl 33. Turned out nice, because I intended to use RL 33. And I now know it shoots well with RL 33. I need to chronograph a little more and see what kind of ES/SD I'm getting. In my past experience, ES/SD improves with RL 33 with the bullets seated close to the lands, and even better with the bullets jammed 0.010-0.015".</p><p></p><p>Right now I'm glad I had shortgrass extend my throat 0.075" with his throating reamer.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1215321, member: 4191"] Thanks Steve. I don't always measure case head expansion. But when I'm working up loads in a new rifle/cartridge in the effort to ID a maximum pressure load, I normally do. A quality dial caliper doesn't fail, when all other indicators can. If the case heads expand 0.0005" or more, I know that's about it. With my case, I've just learned that 107gr of RL 33 is ~100% load density when I jam bullets into the lands 0.012". I tried loading 108.5gr RL 33 with a 0.020" jump, rather than the 0.012" jam, and the bullets won't hold in the necks due to powder compression resistance. I can begin to hear and feel a little powder compression at 107.5gr RL 33 with bullets seated for a 0.012" jam. Greg Duley measured 65,000 psi pressure with 107.5gr RL 33 in his Lapua Improved, with a MV of 2980fps. Your's will probably pressure out similarly if you use RL 33, as Duley stated his Lapua Improved chamber was blow out to the max. Duley also loaded up to 70,000 psi pressure using RL 33 in his rifles, with a MV of 3,020fps. He'll run stronger custom actions up to 70,000 psi pressures. But he didn't share the powder charge for his 70,000psi loading. Greg Duley's loading data with measured pressures. Greg loves RL 33. I want to note that my improved version has a bit less volume capacity than Greg's, and [U]his top powder charge loads generate a little too much pressure[/U] in my 338 Rogue chamber/cartridge. So reader/user be aware. Work up to maximum powder charge in your rifle in a safe manner. [ATTACH=full]88416[/ATTACH] My chamber design is able to fully utilize RL 33 at 100% load density, and reach maximum chamber pressures with the bullets jammed 0.012". I can also seat a little deeper and jump the bullets 0.020" without excessive powder compression with a 107.5gr charge of Rl 33. Turned out nice, because I intended to use RL 33. And I now know it shoots well with RL 33. I need to chronograph a little more and see what kind of ES/SD I'm getting. In my past experience, ES/SD improves with RL 33 with the bullets seated close to the lands, and even better with the bullets jammed 0.010-0.015". Right now I'm glad I had shortgrass extend my throat 0.075" with his throating reamer. [/QUOTE]
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The .338 Rogue
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