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Rifles, Reloading, Optics, Equipment
Gunsmithing
Excess headspace - Win M70 30-06 pre-64
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<blockquote data-quote="Stammster" data-source="post: 1943319" data-attributes="member: 114381"><p>I responded to my original post a few times, but just to clarify in one summary post:</p><p></p><p>1.) My Forester Go gauge chambered</p><p>2.) My Forester No-go gauge chambered</p><p>3.). I don't have an actual field gauge, but I made a "poor boy" one from a laser bore sight in conjunction with my comparator/caliper using the actual gauges in 1 and 2 above, but set to the length of a field gauge. It chambered.</p><p>4.) I further lengthened the laser sight gauge I referenced in # 3 until it did not chamber. It indicate the headspace created by this barrel/bolt combination is 0.003" over SAAMI max, which was consistent with what I measured with fired brass.</p><p></p><p>Basically factory brass goes in at 2.040-2.041" and comes out at 2.055" comparator length as measured by the 0.375" datum on the case neck.</p><p></p><p>Who knows why the bolt was swapped out. Maybe someone who had 2 model 70s and got them swapped by accident. Maybe this gun was reassembled by a beginner gunsmith from a donor barrel, receiver, and/or bolt. Who knows.</p><p></p><p>I've also never seen a pre-64 M70 FWT gun without factory sights.</p></blockquote><p></p>
[QUOTE="Stammster, post: 1943319, member: 114381"] I responded to my original post a few times, but just to clarify in one summary post: 1.) My Forester Go gauge chambered 2.) My Forester No-go gauge chambered 3.). I don’t have an actual field gauge, but I made a “poor boy” one from a laser bore sight in conjunction with my comparator/caliper using the actual gauges in 1 and 2 above, but set to the length of a field gauge. It chambered. 4.) I further lengthened the laser sight gauge I referenced in # 3 until it did not chamber. It indicate the headspace created by this barrel/bolt combination is 0.003” over SAAMI max, which was consistent with what I measured with fired brass. Basically factory brass goes in at 2.040-2.041” and comes out at 2.055” comparator length as measured by the 0.375” datum on the case neck. Who knows why the bolt was swapped out. Maybe someone who had 2 model 70s and got them swapped by accident. Maybe this gun was reassembled by a beginner gunsmith from a donor barrel, receiver, and/or bolt. Who knows. I’ve also never seen a pre-64 M70 FWT gun without factory sights. [/QUOTE]
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Excess headspace - Win M70 30-06 pre-64
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