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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Chamber wont close
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<blockquote data-quote="BountyHunter" data-source="post: 26174" data-attributes="member: 12"><p>I have seen a similar problem and the problem was traced back to pushing the shoulder back too much. It seems you can push out the side of the shoulder case body junction. Gives hard closing and you think shoulder is not being pushed back, when in fact it is being pushed too much. </p><p></p><p>Best way to find out and adjust is to carefully measure each case. Get a stoney point comparator tool with the shoulder comparators that measure the amount you push back. If you have a gun chambered, have your gunsmith take a barrel stub and make you a "shoulder bump gauge". Any good LR/ik BR gunsmith knows what it is.</p><p></p><p>You should keep good records of shoulder location on virgin brass, once fired and just where it starts getting hard to close.</p><p></p><p>Take cases that are hard to close (no need to load bullets, you will feel them)</p><p></p><p>Take a candle and smoke shoulder and neck on a lubed case. for this I use Imperial size wax lube</p><p></p><p>Back die way up, then start down. Watch marks on neck as you come down. Might have to refresh smoke occasionaly until you start hitting the shoulder.</p><p></p><p>Keep coming down until you see smoke smudged on shoulder. </p><p></p><p>Take another case, confirm hard to close in gun, measure location of shoulder. Smoke, resize, clean case and remeasure shoulder. Check in chamber to see if it closes. </p><p></p><p>You want .002 shoulder bump back ideally to keep case close to max size for chamber and avoid overworking the brass.</p><p></p><p>It works best if you remove the firing pin and spring in the bolt, to get a better "feel" on closing bolt.</p><p></p><p>BH</p><p></p><p>[ 04-04-2003: Message edited by: BountyHunter ]</p></blockquote><p></p>
[QUOTE="BountyHunter, post: 26174, member: 12"] I have seen a similar problem and the problem was traced back to pushing the shoulder back too much. It seems you can push out the side of the shoulder case body junction. Gives hard closing and you think shoulder is not being pushed back, when in fact it is being pushed too much. Best way to find out and adjust is to carefully measure each case. Get a stoney point comparator tool with the shoulder comparators that measure the amount you push back. If you have a gun chambered, have your gunsmith take a barrel stub and make you a "shoulder bump gauge". Any good LR/ik BR gunsmith knows what it is. You should keep good records of shoulder location on virgin brass, once fired and just where it starts getting hard to close. Take cases that are hard to close (no need to load bullets, you will feel them) Take a candle and smoke shoulder and neck on a lubed case. for this I use Imperial size wax lube Back die way up, then start down. Watch marks on neck as you come down. Might have to refresh smoke occasionaly until you start hitting the shoulder. Keep coming down until you see smoke smudged on shoulder. Take another case, confirm hard to close in gun, measure location of shoulder. Smoke, resize, clean case and remeasure shoulder. Check in chamber to see if it closes. You want .002 shoulder bump back ideally to keep case close to max size for chamber and avoid overworking the brass. It works best if you remove the firing pin and spring in the bolt, to get a better "feel" on closing bolt. BH [ 04-04-2003: Message edited by: BountyHunter ] [/QUOTE]
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