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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Ejector marks
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<blockquote data-quote="CubCouper" data-source="post: 2722901" data-attributes="member: 68185"><p>A headspace issue can definitely expose itself as something that looks like over-pressure... check out the attached photo. The backstory is this... I was watching a guy set up a 6PPC benchrest rifle. He'd fire a shot, then have to beat his bolt open with a hammer. I saw him shoot twice and stopped the mayhem to see what he was doing. The first guess was that he was shooting the wrong powder, but his load was very typical for a PPC. Further investigation uncovered that he had messed up his resizing die and was pushing the shoulder back about .045-,050". With the bullets seated out to touch the lands, it was functionally headspacing off the bullet ogive -- enough resistance to the case movement that the primers would ignite. But the physical result is that the shoulder blows forward, then seals the chamber, and the case stretches back at the web until the case head runs against the bolt. Case heads were about 60% separated :-]. We fixed his die, same load shot fine.</p><p></p><p>[ATTACH=full]430909[/ATTACH]</p></blockquote><p></p>
[QUOTE="CubCouper, post: 2722901, member: 68185"] A headspace issue can definitely expose itself as something that looks like over-pressure... check out the attached photo. The backstory is this... I was watching a guy set up a 6PPC benchrest rifle. He'd fire a shot, then have to beat his bolt open with a hammer. I saw him shoot twice and stopped the mayhem to see what he was doing. The first guess was that he was shooting the wrong powder, but his load was very typical for a PPC. Further investigation uncovered that he had messed up his resizing die and was pushing the shoulder back about .045-,050". With the bullets seated out to touch the lands, it was functionally headspacing off the bullet ogive -- enough resistance to the case movement that the primers would ignite. But the physical result is that the shoulder blows forward, then seals the chamber, and the case stretches back at the web until the case head runs against the bolt. Case heads were about 60% separated :-]. We fixed his die, same load shot fine. [ATTACH type="full"]430909[/ATTACH] [/QUOTE]
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