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.338 calibers
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<blockquote data-quote="Fiftydriver" data-source="post: 616940" data-attributes="member: 10"><p>I could not agree more with Johns comments about loading your ammo to hot. I know when I developed loads in the 338 ALLEN XPRESS, it was nearly impossible to develope save, known loads using the Lapua brand brass. As such, I had to go a different route to test my ammunition. </p><p> </p><p>Knowing that the 338 Lapua and the 338 Edge have nearly identical case capacity (generally within 1-2 grains of each other) it was easy to use the Remington brass as a standard. Its a known fact that 300 RUM brass will start to have loosened primer pockets with loads much over 65,000 psi. At this level you will generally get 4 firings before the cases need to be retired.</p><p> </p><p>The 338 Lapua brass made by Norma is MUCH softer then the Lapua brand brass. In fact, when shooting over a chronograph, the 338 Lapua made by Norma will start to loosen primer pockets nearly at the identical velocity as a 338 Edge rifle shooting same bullet weight in same barrel length. This told me that the Norma brass would start to loosen primer pockets right at the same 65,000 psi range.</p><p> </p><p>SO WHAT???</p><p> </p><p>Well, this gave me a means to test all of my loads for my wildcats based on the 338 Lapua case. I developed loads for every one of them (277 AM, 7mm AM, 300 AX, 338 AX and 375 AX) using Norma brass and would develope loads working up until case head expansion and primer pocket fit would allow 4 firings per case. Again, telling me that the loads were all producing chamber pressures in the 65 to 68,000 psi range which is right at the top working pressures for modern magnum chamberings.</p><p> </p><p>Now, commerical companies can not load their factory ammo to this same level because they can not test every rifle with this ammo and prove every one is safe so they have to download their ammo with a margin of safety.</p><p> </p><p>As mentioned , I do not have to do that because I do test every rifle and prove its safe. </p><p> </p><p>Now using the Lapua brass, you will, or should NEVER get close to loosening the primer pockets and that is why I ALWAYS give my customers a go to velocity and that they should never go over that. This is because I have tested their rifles to this velocity level and proven them safe to be working in the known 65 to 68,000 psi.</p><p> </p><p>NEVER load your ammo over the recommended velocity range given to you by the rifle manufacturer and if you see pressure signs earlier, stop and contact the maker. Loading any ammo to over 70,000 psi is crazy as powder detonation will occur close after this and that is when things get really serious with large capacity magnums.</p><p> </p><p>Do not overload your ammo, be safe. If you want more velocity, go with a bigger engine!!!</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 616940, member: 10"] I could not agree more with Johns comments about loading your ammo to hot. I know when I developed loads in the 338 ALLEN XPRESS, it was nearly impossible to develope save, known loads using the Lapua brand brass. As such, I had to go a different route to test my ammunition. Knowing that the 338 Lapua and the 338 Edge have nearly identical case capacity (generally within 1-2 grains of each other) it was easy to use the Remington brass as a standard. Its a known fact that 300 RUM brass will start to have loosened primer pockets with loads much over 65,000 psi. At this level you will generally get 4 firings before the cases need to be retired. The 338 Lapua brass made by Norma is MUCH softer then the Lapua brand brass. In fact, when shooting over a chronograph, the 338 Lapua made by Norma will start to loosen primer pockets nearly at the identical velocity as a 338 Edge rifle shooting same bullet weight in same barrel length. This told me that the Norma brass would start to loosen primer pockets right at the same 65,000 psi range. SO WHAT??? Well, this gave me a means to test all of my loads for my wildcats based on the 338 Lapua case. I developed loads for every one of them (277 AM, 7mm AM, 300 AX, 338 AX and 375 AX) using Norma brass and would develope loads working up until case head expansion and primer pocket fit would allow 4 firings per case. Again, telling me that the loads were all producing chamber pressures in the 65 to 68,000 psi range which is right at the top working pressures for modern magnum chamberings. Now, commerical companies can not load their factory ammo to this same level because they can not test every rifle with this ammo and prove every one is safe so they have to download their ammo with a margin of safety. As mentioned , I do not have to do that because I do test every rifle and prove its safe. Now using the Lapua brass, you will, or should NEVER get close to loosening the primer pockets and that is why I ALWAYS give my customers a go to velocity and that they should never go over that. This is because I have tested their rifles to this velocity level and proven them safe to be working in the known 65 to 68,000 psi. NEVER load your ammo over the recommended velocity range given to you by the rifle manufacturer and if you see pressure signs earlier, stop and contact the maker. Loading any ammo to over 70,000 psi is crazy as powder detonation will occur close after this and that is when things get really serious with large capacity magnums. Do not overload your ammo, be safe. If you want more velocity, go with a bigger engine!!! [/QUOTE]
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