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Rifles, Reloading, Optics, Equipment
Reloading
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<blockquote data-quote="Hugnot" data-source="post: 2191762" data-attributes="member: 115658"><p>Bolt action lock-ups:</p><p></p><p>Saw one M70 Win in 6.5-06 that was loaded with a 140 grain bullet, instead of the usual load of just under 50gr of H4831 the same amount of H4895 was used. The rifle was "locked-up" & the barrel needed to be un-screwed from the action so the blasted out base of the cartridge could be picked out of the extractor cut and area all around bolt head. Primer pocket appeared to be .30 caliber or so and was completely blasted out next to extractor cut (coned breach, controlled feed). After that, everything worked real good.</p><p></p><p>The other event occurred when 2400 pistol powder was used in a re-barreled Mexican S/A Mauser to .308 Win in an attempt to get a reduced load. Locked the action up real good and blasted off the cartridge guide on the left side of the bolt (controlled feed) a replacement bolt & extractor was needed, then head-space adjust. ($$$), (controlled feed)</p><p></p><p>Another event occurred when a Rem 700 in .243 was over-loaded with some unknown combo. The bolt handle was pounded on with a boot heel until freed up. Brass was jammed into ejector requiring new ejector & spring, new finger nail extractor. Worked just fine after that (push feed)</p><p></p><p>Another event occurred when a M70 Win in .243 was loaded with an unknown combo using necked down .308 W brass. Total wreck - barrel was blasted 5-8 feet down range. Pressures must have been huge or defective action. I did not see that event. Why bother to pound on bolt handle.</p><p></p><p>In all of the above there was no blood on the bench. Each rifle was chambered for a moderate bolt thrust cartridge and was designed to prevent gas from blasting into shooters face by allowing gas to escape thru bottom of bolt into magazine, thru hole in receiver ring, and blocked by flange on bolt shroud. </p><p></p><p>I seem to remember stuff about plastic deformation where the elastic limits of metal are exceeded and then no recovery. In 2 of these cases the rifles were returned to action with minimal cost.</p><p></p><p>In the subject situation, a .50 BMG round of doubtful quality was fired having a huge amount of bolt thrust (vectored force straight back from chamber) in addition to that, huge amounts of high pressure gas flooded into this threaded bolt cap having more area than chamber & barrel face. As the area increased the force applied to the cap increased as more area was exposed to the increasing pressures. Apparently the floating, spring loaded firing ring pin was driven by a hammer and this and possibly other items were blown loose tearing the shooter ball cap, right side.</p><p></p><p>Sounds like a disaster ready to happen.</p><p></p><p>I now have a carboard target that closely resembles our neighborhood fire hydrant(s) - I hope to hang it up at 1,000 yards but will settle for 500. Don't plan to leave it for over-night marking - day light use only.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2191762, member: 115658"] Bolt action lock-ups: Saw one M70 Win in 6.5-06 that was loaded with a 140 grain bullet, instead of the usual load of just under 50gr of H4831 the same amount of H4895 was used. The rifle was "locked-up" & the barrel needed to be un-screwed from the action so the blasted out base of the cartridge could be picked out of the extractor cut and area all around bolt head. Primer pocket appeared to be .30 caliber or so and was completely blasted out next to extractor cut (coned breach, controlled feed). After that, everything worked real good. The other event occurred when 2400 pistol powder was used in a re-barreled Mexican S/A Mauser to .308 Win in an attempt to get a reduced load. Locked the action up real good and blasted off the cartridge guide on the left side of the bolt (controlled feed) a replacement bolt & extractor was needed, then head-space adjust. ($$$), (controlled feed) Another event occurred when a Rem 700 in .243 was over-loaded with some unknown combo. The bolt handle was pounded on with a boot heel until freed up. Brass was jammed into ejector requiring new ejector & spring, new finger nail extractor. Worked just fine after that (push feed) Another event occurred when a M70 Win in .243 was loaded with an unknown combo using necked down .308 W brass. Total wreck - barrel was blasted 5-8 feet down range. Pressures must have been huge or defective action. I did not see that event. Why bother to pound on bolt handle. In all of the above there was no blood on the bench. Each rifle was chambered for a moderate bolt thrust cartridge and was designed to prevent gas from blasting into shooters face by allowing gas to escape thru bottom of bolt into magazine, thru hole in receiver ring, and blocked by flange on bolt shroud. I seem to remember stuff about plastic deformation where the elastic limits of metal are exceeded and then no recovery. In 2 of these cases the rifles were returned to action with minimal cost. In the subject situation, a .50 BMG round of doubtful quality was fired having a huge amount of bolt thrust (vectored force straight back from chamber) in addition to that, huge amounts of high pressure gas flooded into this threaded bolt cap having more area than chamber & barrel face. As the area increased the force applied to the cap increased as more area was exposed to the increasing pressures. Apparently the floating, spring loaded firing ring pin was driven by a hammer and this and possibly other items were blown loose tearing the shooter ball cap, right side. Sounds like a disaster ready to happen. I now have a carboard target that closely resembles our neighborhood fire hydrant(s) - I hope to hang it up at 1,000 yards but will settle for 500. Don't plan to leave it for over-night marking - day light use only. [/QUOTE]
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