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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
375 Remington Ultra Magnum necked up to 50 caliber (.510)
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<blockquote data-quote="widlin1" data-source="post: 1300300" data-attributes="member: 53351"><p>I just stumble onto this thread with a search for Accurate Mag Chassis and thought I would add to it with some experience I had necking up and shortening .338 Lapua brass. Using multiple expanders and several annealing steps I was able to make brass and fire form in a lathe turned chamber with a reamer cut throat. I trimmed the brass to 2.540 to head spaced on the cartridge mouth, fire formed with a M33 ball projectile and 82 grains of BL-C(2) to make a small shoulder. Fire forming shortened the case to 2.525 or slightly longer. With 89 grains of the same powder I got up to 1900 fps with no signs of excessive pressure. With MK 211 bullets OAL was designed to be 4.175 to fit the max length of the PSR magazine. With Barnes TSX OAL was 3.85 inch.</p><p></p><p>Quick load indicated higher velocity with CFE 223, but I didn't have any at the time and have since put the Rigby barrel back on the rifle. Below are a few pictures I took along the way. Quick load also predicted 2300 fps doing the same neck up and trim to 408 Chetac brass and using a 27 inch barrel. That load would come very close to the trajectory of M118LR and cause detonation of the MK211 out to about 1400 meters.</p><p></p><p>Jeff</p><p></p><p><u><a href="http://s461.photobucket.com/user/Widlin1a/media/Rifle%20and%20ammo%20prep.png.html" target="_blank"><img src="http://i461.photobucket.com/albums/qq335/Widlin1a/Rifle%20and%20ammo%20prep.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></u></p><p></p><p><u><a href="http://s461.photobucket.com/user/Widlin1a/media/After%20Fire%20Form%201.jpg.html" target="_blank"><img src="http://i461.photobucket.com/albums/qq335/Widlin1a/After%20Fire%20Form%201.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></u></p><p></p><p><u><a href="http://s461.photobucket.com/user/Widlin1a/media/Expander%20Turret.jpg.html" target="_blank"><img src="http://i461.photobucket.com/albums/qq335/Widlin1a/Expander%20Turret.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></u></p><p></p><p><u><a href="http://s461.photobucket.com/user/Widlin1a/media/Neck%20Turning.jpg.html" target="_blank"><img src="http://i461.photobucket.com/albums/qq335/Widlin1a/Neck%20Turning.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></u></p><p></p><p><u><a href="http://s461.photobucket.com/user/Widlin1a/media/IMG_20131111_201323_869.jpg.html" target="_blank"><img src="http://i461.photobucket.com/albums/qq335/Widlin1a/IMG_20131111_201323_869.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></u></p><p></p><p><u><a href="http://s461.photobucket.com/user/Widlin1a/media/Trimming%20to%20length.jpg.html" target="_blank"><img src="http://i461.photobucket.com/albums/qq335/Widlin1a/Trimming%20to%20length.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></u></p></blockquote><p></p>
[QUOTE="widlin1, post: 1300300, member: 53351"] I just stumble onto this thread with a search for Accurate Mag Chassis and thought I would add to it with some experience I had necking up and shortening .338 Lapua brass. Using multiple expanders and several annealing steps I was able to make brass and fire form in a lathe turned chamber with a reamer cut throat. I trimmed the brass to 2.540 to head spaced on the cartridge mouth, fire formed with a M33 ball projectile and 82 grains of BL-C(2) to make a small shoulder. Fire forming shortened the case to 2.525 or slightly longer. With 89 grains of the same powder I got up to 1900 fps with no signs of excessive pressure. With MK 211 bullets OAL was designed to be 4.175 to fit the max length of the PSR magazine. With Barnes TSX OAL was 3.85 inch. Quick load indicated higher velocity with CFE 223, but I didn't have any at the time and have since put the Rigby barrel back on the rifle. Below are a few pictures I took along the way. Quick load also predicted 2300 fps doing the same neck up and trim to 408 Chetac brass and using a 27 inch barrel. That load would come very close to the trajectory of M118LR and cause detonation of the MK211 out to about 1400 meters. Jeff [U][URL="http://s461.photobucket.com/user/Widlin1a/media/Rifle%20and%20ammo%20prep.png.html"][IMG]http://i461.photobucket.com/albums/qq335/Widlin1a/Rifle%20and%20ammo%20prep.png[/IMG][/URL][/U] [U][URL="http://s461.photobucket.com/user/Widlin1a/media/After%20Fire%20Form%201.jpg.html"][IMG]http://i461.photobucket.com/albums/qq335/Widlin1a/After%20Fire%20Form%201.jpg[/IMG][/URL][/U] [U][URL="http://s461.photobucket.com/user/Widlin1a/media/Expander%20Turret.jpg.html"][IMG]http://i461.photobucket.com/albums/qq335/Widlin1a/Expander%20Turret.jpg[/IMG][/URL][/U] [U][URL="http://s461.photobucket.com/user/Widlin1a/media/Neck%20Turning.jpg.html"][IMG]http://i461.photobucket.com/albums/qq335/Widlin1a/Neck%20Turning.jpg[/IMG][/URL][/U] [U][URL="http://s461.photobucket.com/user/Widlin1a/media/IMG_20131111_201323_869.jpg.html"][IMG]http://i461.photobucket.com/albums/qq335/Widlin1a/IMG_20131111_201323_869.jpg[/IMG][/URL][/U] [U][URL="http://s461.photobucket.com/user/Widlin1a/media/Trimming%20to%20length.jpg.html"][IMG]http://i461.photobucket.com/albums/qq335/Widlin1a/Trimming%20to%20length.jpg[/IMG][/URL][/U] [/QUOTE]
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375 Remington Ultra Magnum necked up to 50 caliber (.510)
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