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Rifles, Reloading, Optics, Equipment
Reloading
Neck Sizing, groupings, and chambering issues
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<blockquote data-quote="westcliffe01" data-source="post: 528049" data-attributes="member: 35183"><p>I recently ran into trouble with inconsistent case lengths on my 7.62x38 reloads. Since the brass was once fired, I didn't check its overall length or trim any of it. When it came to seating the bullets, I noticed a distinct difference in the "feel" of the bullet seating operation between different shells. I later discovered that the case neck had been distorted (bulged outwards slightly in diameter) due to the variation in case length. The thin neck will only remain stable up to a certain force in the bullet seating operation. If that is exceeded I have seen 2 different things happen: 1) The neck expands (seen on my 7.62x39) or 2) The junction of the shoulder to the main cartridge diameter is distorted (bulges outward) which I saw on some of my 8mm mauser cartridges.</p><p></p><p>In both cases the cartridges would not chamber and in neither case did it have anything to do with the amount of powder in the case. I would say that if my 7.62x39 was a bolt action, I would probably get the bolt closed on it, but my ar15 is too wimpy and the camming action too weak.</p><p></p><p>So be sure that your case lengths are identical. Backing off the full length die 3/4 turn may be a bit much. You should lower it until you can tell that it starts touching the shoulder and stop right there. Moving the shoulder back takes more force for sure...</p></blockquote><p></p>
[QUOTE="westcliffe01, post: 528049, member: 35183"] I recently ran into trouble with inconsistent case lengths on my 7.62x38 reloads. Since the brass was once fired, I didn't check its overall length or trim any of it. When it came to seating the bullets, I noticed a distinct difference in the "feel" of the bullet seating operation between different shells. I later discovered that the case neck had been distorted (bulged outwards slightly in diameter) due to the variation in case length. The thin neck will only remain stable up to a certain force in the bullet seating operation. If that is exceeded I have seen 2 different things happen: 1) The neck expands (seen on my 7.62x39) or 2) The junction of the shoulder to the main cartridge diameter is distorted (bulges outward) which I saw on some of my 8mm mauser cartridges. In both cases the cartridges would not chamber and in neither case did it have anything to do with the amount of powder in the case. I would say that if my 7.62x39 was a bolt action, I would probably get the bolt closed on it, but my ar15 is too wimpy and the camming action too weak. So be sure that your case lengths are identical. Backing off the full length die 3/4 turn may be a bit much. You should lower it until you can tell that it starts touching the shoulder and stop right there. Moving the shoulder back takes more force for sure... [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Neck Sizing, groupings, and chambering issues
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