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Rifles, Reloading, Optics, Equipment
Reloading
Kirby Allen’s “no load development” load development method.
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<blockquote data-quote="Fiftydriver" data-source="post: 697367" data-attributes="member: 10"><p>My wildcats based on the RUM parent case, those being the 257 Allen Mag, 6.5mm Allen Mag, 270 Allen Mag and the 338 Ultra Maxx perform exactly how your are discribing. Rem brass is right in the middle of the road for hardness from what I have found.</p><p> </p><p>In my Lapua based wildcats, those being the 277 Allen Mag, 7mm Allen Mag, 300 Allen Xpress, 338 Allen Xpress and 375 Allen Xpress, I could not use the Lapua brand brass while doing load development. Simply put this brass was to hard to read any early pressure signs. The Lapua brand brass will take +70,000 psi and not even blink. What appears to be a great load will be WAY over pressures.</p><p> </p><p>This was very important when I started offering my wildcats to the public because at that time I was rebuilding the Rem 700 receivers and building them in my Lapua based wildcats. The Rem 700 is a great receiver but if loaded improperly, the 338 Lapua parent case can handle far more chamber pressure then the Rem 700 should be exposed to long term.</p><p> </p><p>SO, when I developed my loads for my Lapua based wildcats, I used the Norma brand 338 Lapua cases. To do my comparision, the 338 Edge and the 338 Lapua have nearly identical case capacities. Depending on brand and lot of brass the two are generally within 1-2 grains and at times they can swap which has the largest capacity. For all intent and purpose, they are identical in capacity.</p><p> </p><p>When you load then both to 2850 fps in a 30" barrel length with a 300 gr SMK, they also produced what appeared to be IDENTICAL pressures. Taking the experiment farther, when you loaded both cases to the point where they just started to loosen their primer pockets on the first firing, they were both at the same powder charge and right at 2950 fps. So, Same powder charge produced the same pressures, same velocity which gave me a base like to develope loads.</p><p> </p><p>Knowing where the point was where the primer pockets started to let loose, and then backtracking to see where primer pockets would hold for 6-8 firings, I knew what my margin of error was and where I SHOULD be loading to as far as velocity was concerned.</p><p> </p><p>PLEASE understand this is not loading recommendations, this was a test to find the pressure limits of each case and I do not recommend anyone do this. This was in a very controlled test with a very specific purpose.</p><p> </p><p>Now with that information in hand I developed loads for all my wildcats on the Lapua case using the Norma brand of brass to the same pressure levels produced in the earlier tests. Max loads would offer +6 firings in the Norma brand brass.</p><p> </p><p>When load development was done, I switched to the Lapua brand brass and have yet to loosen a primer pocket with that brass. These top loads will get +8 firings per case and at times +10. This is not because the primer pockets let loose. Its simply because the brass work hardens enough that as the cases get very old, they extraction starts to get sticky from the min body taper for max case capacity in this design. Again, primer pockets have never loosened on my recommend loads.</p><p> </p><p>Hope this clearifies things.</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 697367, member: 10"] My wildcats based on the RUM parent case, those being the 257 Allen Mag, 6.5mm Allen Mag, 270 Allen Mag and the 338 Ultra Maxx perform exactly how your are discribing. Rem brass is right in the middle of the road for hardness from what I have found. In my Lapua based wildcats, those being the 277 Allen Mag, 7mm Allen Mag, 300 Allen Xpress, 338 Allen Xpress and 375 Allen Xpress, I could not use the Lapua brand brass while doing load development. Simply put this brass was to hard to read any early pressure signs. The Lapua brand brass will take +70,000 psi and not even blink. What appears to be a great load will be WAY over pressures. This was very important when I started offering my wildcats to the public because at that time I was rebuilding the Rem 700 receivers and building them in my Lapua based wildcats. The Rem 700 is a great receiver but if loaded improperly, the 338 Lapua parent case can handle far more chamber pressure then the Rem 700 should be exposed to long term. SO, when I developed my loads for my Lapua based wildcats, I used the Norma brand 338 Lapua cases. To do my comparision, the 338 Edge and the 338 Lapua have nearly identical case capacities. Depending on brand and lot of brass the two are generally within 1-2 grains and at times they can swap which has the largest capacity. For all intent and purpose, they are identical in capacity. When you load then both to 2850 fps in a 30" barrel length with a 300 gr SMK, they also produced what appeared to be IDENTICAL pressures. Taking the experiment farther, when you loaded both cases to the point where they just started to loosen their primer pockets on the first firing, they were both at the same powder charge and right at 2950 fps. So, Same powder charge produced the same pressures, same velocity which gave me a base like to develope loads. Knowing where the point was where the primer pockets started to let loose, and then backtracking to see where primer pockets would hold for 6-8 firings, I knew what my margin of error was and where I SHOULD be loading to as far as velocity was concerned. PLEASE understand this is not loading recommendations, this was a test to find the pressure limits of each case and I do not recommend anyone do this. This was in a very controlled test with a very specific purpose. Now with that information in hand I developed loads for all my wildcats on the Lapua case using the Norma brand of brass to the same pressure levels produced in the earlier tests. Max loads would offer +6 firings in the Norma brand brass. When load development was done, I switched to the Lapua brand brass and have yet to loosen a primer pocket with that brass. These top loads will get +8 firings per case and at times +10. This is not because the primer pockets let loose. Its simply because the brass work hardens enough that as the cases get very old, they extraction starts to get sticky from the min body taper for max case capacity in this design. Again, primer pockets have never loosened on my recommend loads. Hope this clearifies things. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Kirby Allen’s “no load development” load development method.
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