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What would you do?
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<blockquote data-quote="Majopikeras" data-source="post: 1571871" data-attributes="member: 32407"><p>Let me suggest:</p><p></p><p>1. Give your chamber a good cleaning</p><p>2. Expand your case neck to. 308 cal</p><p>3. Set your sizing die 2 full turns back and size the case. </p><p>4. Try to chamber the case (it shouldn't chamber)</p><p>5. Screw your die 1/5 turn, size, try to chamber.</p><p>6. Repeat step 5 until you just close the bolt under some resistance.</p><p>7. Now you have a 7mm neck, and a step to. 308 cal (false shoulder which is giving that resistance against chamber)</p><p>8. Seat bullets slightly jammed if you want.</p><p>9. Shoot to fireform</p><p>10. When you size again., use neck size or bump shoulder 2thou back</p><p></p><p></p><p>If you fireform just jamming bullets, you will Not have misfires but you will have case head separation. This effect is probably more pronounced with belted magnums. The false shoulder holds the case and it's just the shoulder blowing out. This method is causing extra work to the neck but you can deal with it annealing if need be but you can't deal with a case head separation (well you can buy new brass <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /> )</p><p></p><p>Hope this helps ...</p></blockquote><p></p>
[QUOTE="Majopikeras, post: 1571871, member: 32407"] Let me suggest: 1. Give your chamber a good cleaning 2. Expand your case neck to. 308 cal 3. Set your sizing die 2 full turns back and size the case. 4. Try to chamber the case (it shouldn't chamber) 5. Screw your die 1/5 turn, size, try to chamber. 6. Repeat step 5 until you just close the bolt under some resistance. 7. Now you have a 7mm neck, and a step to. 308 cal (false shoulder which is giving that resistance against chamber) 8. Seat bullets slightly jammed if you want. 9. Shoot to fireform 10. When you size again., use neck size or bump shoulder 2thou back If you fireform just jamming bullets, you will Not have misfires but you will have case head separation. This effect is probably more pronounced with belted magnums. The false shoulder holds the case and it's just the shoulder blowing out. This method is causing extra work to the neck but you can deal with it annealing if need be but you can't deal with a case head separation (well you can buy new brass ;) ) Hope this helps ... [/QUOTE]
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