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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
New .338 lanches a 300gr Sierra MK at 3500fps?
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<blockquote data-quote="Steve Shelp" data-source="post: 21910" data-attributes="member: 22"><p>Brent,</p><p> You've just got to make sure you don't "stand on" your brass to much during the first couple of firings or the primer pockets will open up and you'll see some peening on the front edge of the belt. Some refer to this as the double belt. But you had made a comment above about watching the belt diameter and such so just keep doing what you've been doing and you'll be ok.</p><p></p><p>This has always been a draw back when using any of the Weatherby belted cases which are produced by Norma. Norma cases are soft and it's easy to open the primer pockets up with normaly safe loads if your not careful. There's been many things tried to get around it. The best is to miniumun headspace the chamber and don't bump your shoulder unless you have to. Some have even gone as far as cutting the belt off the cases (tried it myself) but that wasn't a good solution either. It's the soft brass. </p><p></p><p>In my 6.5-300 Weatherby, I switched to using WW Super 300 H&H brass and blowing it out rather than using the 300 Weatherby brass. The same load in 300 Weatherby brass open the pockets up in 3 or 4 firings, but I still have roughly (90) some out of (100) 300 H&H Winchester cases that I bought back in the early 90's and have been fired more than 4 times and those pockets are still tight enough to safely load and shoot again.</p><p> You don't have that option with 378 brass obviosuly.</p><p></p><p>Let me know if this didn't answer your question.</p><p></p><p>Steve</p></blockquote><p></p>
[QUOTE="Steve Shelp, post: 21910, member: 22"] Brent, You've just got to make sure you don't "stand on" your brass to much during the first couple of firings or the primer pockets will open up and you'll see some peening on the front edge of the belt. Some refer to this as the double belt. But you had made a comment above about watching the belt diameter and such so just keep doing what you've been doing and you'll be ok. This has always been a draw back when using any of the Weatherby belted cases which are produced by Norma. Norma cases are soft and it's easy to open the primer pockets up with normaly safe loads if your not careful. There's been many things tried to get around it. The best is to miniumun headspace the chamber and don't bump your shoulder unless you have to. Some have even gone as far as cutting the belt off the cases (tried it myself) but that wasn't a good solution either. It's the soft brass. In my 6.5-300 Weatherby, I switched to using WW Super 300 H&H brass and blowing it out rather than using the 300 Weatherby brass. The same load in 300 Weatherby brass open the pockets up in 3 or 4 firings, but I still have roughly (90) some out of (100) 300 H&H Winchester cases that I bought back in the early 90's and have been fired more than 4 times and those pockets are still tight enough to safely load and shoot again. You don't have that option with 378 brass obviosuly. Let me know if this didn't answer your question. Steve [/QUOTE]
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New .338 lanches a 300gr Sierra MK at 3500fps?
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