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Rifles, Reloading, Optics, Equipment
Reloading
Why am I splitting necks?
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<blockquote data-quote="MNbogboy" data-source="post: 1460329" data-attributes="member: 18849"><p>A couple of thoughts;</p><p>1. Come back out pretty stiff (maybe donuts).</p><p>2. Post #13 had some head separation ? (Over sizing length)...</p><p>3. Post #28 .002 bump which is good but would not account for earlier head separation. Did you change your sizing?</p><p>4. I once neck sized a 260 for a while and then switched to fls...the worst case of donuts result. The expander pulled real hard out (like you mentioned). The bullets seated deep pushed the donut back out. My best guess was the donut material was "nicked" (for lack of a better word) during chambering/firing. The damaged (thin)spot at the neck/shoulder junction now became the weak link and was stretched thinner at each successive firing.</p><p>Neck splits as yours began shortly after. They could be spotted prior to splitting as a small imperfection. Often a small split wasn't spotted until the brass was loaded.</p><p>Cure was start over with new brass (rem) from same lot. FLS only with .002 bump. Check and ream donuts after every firing (usually only twice and they didn't show up anymore). Got up to 35 loadings from that lot but usually the pockets were gone by 20. One more thing I don't anneal until bullet seating becomes erratic.</p><p>My nickels worth,</p><p>Randy</p></blockquote><p></p>
[QUOTE="MNbogboy, post: 1460329, member: 18849"] A couple of thoughts; 1. Come back out pretty stiff (maybe donuts). 2. Post #13 had some head separation ? (Over sizing length)... 3. Post #28 .002 bump which is good but would not account for earlier head separation. Did you change your sizing? 4. I once neck sized a 260 for a while and then switched to fls...the worst case of donuts result. The expander pulled real hard out (like you mentioned). The bullets seated deep pushed the donut back out. My best guess was the donut material was "nicked" (for lack of a better word) during chambering/firing. The damaged (thin)spot at the neck/shoulder junction now became the weak link and was stretched thinner at each successive firing. Neck splits as yours began shortly after. They could be spotted prior to splitting as a small imperfection. Often a small split wasn't spotted until the brass was loaded. Cure was start over with new brass (rem) from same lot. FLS only with .002 bump. Check and ream donuts after every firing (usually only twice and they didn't show up anymore). Got up to 35 loadings from that lot but usually the pockets were gone by 20. One more thing I don't anneal until bullet seating becomes erratic. My nickels worth, Randy [/QUOTE]
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Reloading
Why am I splitting necks?
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