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Rifles, Reloading, Optics, Equipment
Reloading
264 WM heavy bolt lift
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<blockquote data-quote="bigngreen" data-source="post: 1184935" data-attributes="member: 13632"><p>This is such basic trouble shooting it hurts, the OP is firing 140 Accubonds at 3250 with 68 gr if retumbo his first 4 shots with the Ballistic tip his velocity dropped so his pressure dropped given that the second bullet though exact in design is softer so you'd expect lower pressure by a little. </p><p>The offending case is sticky with lube, not a little, sticky! What are the odds of the one case that is sticky is also the case that had a heavy bolt lift!</p><p>A number of years ago we had the exact same issue on the forum, went for pages till the OP and a couple other guys actually recreated the issue and guess what, something reducing chamber wall traction with the case caused excessive pressure signs and bolt lift. Not all that difficult a deal, the OP seems to all ready know what happened but wants to verify it with other, he's on the right track!</p><p>Simpy lifting the bolt has zero to do with the case outward expansion UNTIL the very top with is primary extraction, so if you have a heavy bolt lift from the bottom it's not expansion is thrust holding the bolt, when you have EXTRACTION issues at the top that is cases holding tight to the chamber, lube creates larger bolt thrust which gives you heavy lift!</p></blockquote><p></p>
[QUOTE="bigngreen, post: 1184935, member: 13632"] This is such basic trouble shooting it hurts, the OP is firing 140 Accubonds at 3250 with 68 gr if retumbo his first 4 shots with the Ballistic tip his velocity dropped so his pressure dropped given that the second bullet though exact in design is softer so you'd expect lower pressure by a little. The offending case is sticky with lube, not a little, sticky! What are the odds of the one case that is sticky is also the case that had a heavy bolt lift! A number of years ago we had the exact same issue on the forum, went for pages till the OP and a couple other guys actually recreated the issue and guess what, something reducing chamber wall traction with the case caused excessive pressure signs and bolt lift. Not all that difficult a deal, the OP seems to all ready know what happened but wants to verify it with other, he's on the right track! Simpy lifting the bolt has zero to do with the case outward expansion UNTIL the very top with is primary extraction, so if you have a heavy bolt lift from the bottom it's not expansion is thrust holding the bolt, when you have EXTRACTION issues at the top that is cases holding tight to the chamber, lube creates larger bolt thrust which gives you heavy lift! [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
264 WM heavy bolt lift
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