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Long Range Hunting & Shooting
Why won’t my bolt close?
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<blockquote data-quote="Dell" data-source="post: 1693192" data-attributes="member: 80665"><p>Ha</p><p></p><p>I had the same issue with my beloved 7mm mag. My pet 1/2 MOA Elk Rifle. It's a LR keeper. Schneider barrel, tight match chamber, several one shot drop elk kills out to 820 yards. Many in the 5-600 category. After wearing out one barrel (I used the rifle for local monthly LR steel completion at 1100 yards thru a mile) and lots of rounds in between I had the new barrel installed. I never lost a thing in accuracy on barrel #2 but found with neck sizing only, about half the rounds would not allow the bolt to close. Next step was a Forster neck bushing bump die. Bumped the shoulders back .002-.003 and sized the neck only (trimming cases to length,by the way, is important if you are finding your brass close to the limit after firing). Even with the Forster shoulder bump die procedure, the bolt was closing hard. Way to hard for me. Finally, I called Whidden Gun Works (go to You Tube and search Whidden Gun Works and watch his FL resizing / shoulder bump video). I ordered a Whidden FL neck bushing die. I bump the shoulders at .003 and the Neck bushing .002 less than my best loaded 180 Berger rounds. This is the answer that worked best for me! I full length size all my 7 mag fired brass and the bolt closes smoothly and properly every time. Good news? Not a smidge lost in accuracy with this procedure out of this rifle. I ran a batch of once fired brass thru the process yesterday and decided to check the run out on this batch of brass (Norma) after resizing. I was totally thrilled to see the run out at .001 or less on all 50 pieces of brass. The needle on the Sinclair concentricity tool barely moved. I can't say enough good things about the set of Whidden Gun Works dies I have. I'm a fan. They can even make dies for your specific rifle if you supply them brass. They are a tad spendy but you get what you pay for. By the way, I still neck size only for two other fav rifles. A .260 and a .308. They both handle 3-4 neck sizings before a FL sizing is necessary. I think my issue with the 7 mag is a super tight match chamber. Bit tighter than SAMMI specs but handles new and FL sized brass perfectly and shoots incredibly well. I'm a happy camper.</p></blockquote><p></p>
[QUOTE="Dell, post: 1693192, member: 80665"] Ha I had the same issue with my beloved 7mm mag. My pet 1/2 MOA Elk Rifle. It’s a LR keeper. Schneider barrel, tight match chamber, several one shot drop elk kills out to 820 yards. Many in the 5-600 category. After wearing out one barrel (I used the rifle for local monthly LR steel completion at 1100 yards thru a mile) and lots of rounds in between I had the new barrel installed. I never lost a thing in accuracy on barrel #2 but found with neck sizing only, about half the rounds would not allow the bolt to close. Next step was a Forster neck bushing bump die. Bumped the shoulders back .002-.003 and sized the neck only (trimming cases to length,by the way, is important if you are finding your brass close to the limit after firing). Even with the Forster shoulder bump die procedure, the bolt was closing hard. Way to hard for me. Finally, I called Whidden Gun Works (go to You Tube and search Whidden Gun Works and watch his FL resizing / shoulder bump video). I ordered a Whidden FL neck bushing die. I bump the shoulders at .003 and the Neck bushing .002 less than my best loaded 180 Berger rounds. This is the answer that worked best for me! I full length size all my 7 mag fired brass and the bolt closes smoothly and properly every time. Good news? Not a smidge lost in accuracy with this procedure out of this rifle. I ran a batch of once fired brass thru the process yesterday and decided to check the run out on this batch of brass (Norma) after resizing. I was totally thrilled to see the run out at .001 or less on all 50 pieces of brass. The needle on the Sinclair concentricity tool barely moved. I can’t say enough good things about the set of Whidden Gun Works dies I have. I’m a fan. They can even make dies for your specific rifle if you supply them brass. They are a tad spendy but you get what you pay for. By the way, I still neck size only for two other fav rifles. A .260 and a .308. They both handle 3-4 neck sizings before a FL sizing is necessary. I think my issue with the 7 mag is a super tight match chamber. Bit tighter than SAMMI specs but handles new and FL sized brass perfectly and shoots incredibly well. I’m a happy camper. [/QUOTE]
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