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Rifles, Reloading, Optics, Equipment
Reloading
Ran into signs of pressure sooner than expected with .300WSM. Need input
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<blockquote data-quote="Dentite" data-source="post: 1004136" data-attributes="member: 84845"><p>Okay guys, here are a few photos. The ejector marks are visible on most of the brass I fired but none are what I would call very obvious. I had to rotate the brass and vary the angle of the camera to capture them clearly. At the bench on the day of shooting, I studied each piece using the sun to reflect light back and rotating the brass to find the marks.</p><p> </p><p><a href="http://s1137.photobucket.com/user/jschmiddy/media/Brass/IMG_7343small2_zps1212e49f.jpg.html" target="_blank"><img src="http://i1137.photobucket.com/albums/n507/jschmiddy/Brass/IMG_7343small2_zps1212e49f.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p> </p><p><a href="http://s1137.photobucket.com/user/jschmiddy/media/Brass/IMG_7343small3_zps204d23b9.jpg.html" target="_blank"><img src="http://i1137.photobucket.com/albums/n507/jschmiddy/Brass/IMG_7343small3_zps204d23b9.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p> </p><p><a href="http://s1137.photobucket.com/user/jschmiddy/media/Brass/IMG_7343small_zps35806abc.jpg.html" target="_blank"><img src="http://i1137.photobucket.com/albums/n507/jschmiddy/Brass/IMG_7343small_zps35806abc.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p> </p><p>Here are some photos of the ejector and bolt face. The blue color is from the sharpie marker I used on the primers for identification.</p><p> </p><p><a href="http://s1137.photobucket.com/user/jschmiddy/media/Brass/IMG_7367small_zps9e913b2e.jpg.html" target="_blank"><img src="http://i1137.photobucket.com/albums/n507/jschmiddy/Brass/IMG_7367small_zps9e913b2e.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p> </p><p><a href="http://s1137.photobucket.com/user/jschmiddy/media/Brass/IMG_7368small_zps5e24bdae.jpg.html" target="_blank"><img src="http://i1137.photobucket.com/albums/n507/jschmiddy/Brass/IMG_7368small_zps5e24bdae.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p> </p><p>My baseline for experience is handloading a .260Rem and a couple .223Rem. I handload other cartridges but spend the bulk of my accuracy efforts on those two. </p><p> </p><p>With my .260 I did a pressure test where I started at the middle of published data and progressively worked up and I began to see signs of pressure very slowly and predictably. Started to slowly get ejector marks and slightly heavier bolt lift. The velocities indicated by my chronograph agreed that I was getting hot (nearing 3000 ft/sec with a 140 grain bullet and H4350 and a 26" barrel).</p><p> </p><p>With my .223 Rem bolt action I always get a bit of primer cratering and flattening of the primers but as pressure goes up the cratering and flattening gets worse. Can't say I've every seen an ejector mark on my .223 brass even though its the same type as my .260.</p><p></p><p>Here's some .223 rounds that I recently fired and was surprised to see that my bread and butter load that previously gave 3100ft/sec and <0.5" groups had jumped up to 3220ft/sec. I had switched brass and it made more a difference than I had anticipated. I should have worked up the load again but I was lazy. Here's some .223 brass that was 3220 ft/sec or so. No heavy bolt lift, no visible ejector marks, but pretty heavy cratering of the primer indicating increased primer flow around the firing pin.</p><p> </p><p><a href="http://s1137.photobucket.com/user/jschmiddy/media/Brass/IMG_7350small_zps72088679.jpg.html" target="_blank"><img src="http://i1137.photobucket.com/albums/n507/jschmiddy/Brass/IMG_7350small_zps72088679.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p></blockquote><p></p>
[QUOTE="Dentite, post: 1004136, member: 84845"] Okay guys, here are a few photos. The ejector marks are visible on most of the brass I fired but none are what I would call very obvious. I had to rotate the brass and vary the angle of the camera to capture them clearly. At the bench on the day of shooting, I studied each piece using the sun to reflect light back and rotating the brass to find the marks. [URL=http://s1137.photobucket.com/user/jschmiddy/media/Brass/IMG_7343small2_zps1212e49f.jpg.html][IMG]http://i1137.photobucket.com/albums/n507/jschmiddy/Brass/IMG_7343small2_zps1212e49f.jpg[/IMG][/URL] [URL=http://s1137.photobucket.com/user/jschmiddy/media/Brass/IMG_7343small3_zps204d23b9.jpg.html][IMG]http://i1137.photobucket.com/albums/n507/jschmiddy/Brass/IMG_7343small3_zps204d23b9.jpg[/IMG][/URL] [URL=http://s1137.photobucket.com/user/jschmiddy/media/Brass/IMG_7343small_zps35806abc.jpg.html][IMG]http://i1137.photobucket.com/albums/n507/jschmiddy/Brass/IMG_7343small_zps35806abc.jpg[/IMG][/URL] Here are some photos of the ejector and bolt face. The blue color is from the sharpie marker I used on the primers for identification. [URL=http://s1137.photobucket.com/user/jschmiddy/media/Brass/IMG_7367small_zps9e913b2e.jpg.html][IMG]http://i1137.photobucket.com/albums/n507/jschmiddy/Brass/IMG_7367small_zps9e913b2e.jpg[/IMG][/URL] [URL=http://s1137.photobucket.com/user/jschmiddy/media/Brass/IMG_7368small_zps5e24bdae.jpg.html][IMG]http://i1137.photobucket.com/albums/n507/jschmiddy/Brass/IMG_7368small_zps5e24bdae.jpg[/IMG][/URL] My baseline for experience is handloading a .260Rem and a couple .223Rem. I handload other cartridges but spend the bulk of my accuracy efforts on those two. With my .260 I did a pressure test where I started at the middle of published data and progressively worked up and I began to see signs of pressure very slowly and predictably. Started to slowly get ejector marks and slightly heavier bolt lift. The velocities indicated by my chronograph agreed that I was getting hot (nearing 3000 ft/sec with a 140 grain bullet and H4350 and a 26" barrel). With my .223 Rem bolt action I always get a bit of primer cratering and flattening of the primers but as pressure goes up the cratering and flattening gets worse. Can't say I've every seen an ejector mark on my .223 brass even though its the same type as my .260. Here's some .223 rounds that I recently fired and was surprised to see that my bread and butter load that previously gave 3100ft/sec and <0.5" groups had jumped up to 3220ft/sec. I had switched brass and it made more a difference than I had anticipated. I should have worked up the load again but I was lazy. Here's some .223 brass that was 3220 ft/sec or so. No heavy bolt lift, no visible ejector marks, but pretty heavy cratering of the primer indicating increased primer flow around the firing pin. [URL=http://s1137.photobucket.com/user/jschmiddy/media/Brass/IMG_7350small_zps72088679.jpg.html][IMG]http://i1137.photobucket.com/albums/n507/jschmiddy/Brass/IMG_7350small_zps72088679.jpg[/IMG][/URL] [/QUOTE]
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Ran into signs of pressure sooner than expected with .300WSM. Need input
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