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Rifles, Reloading, Optics, Equipment
Reloading
Strange occurrence at the range today with handloads
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<blockquote data-quote="Hugnot" data-source="post: 3027484" data-attributes="member: 115658"><p>W760 is a dense ball powder. Nosler load data for the .257 Wby has 64 gr W760 for 85 grain bullets & uses Fed 215 primers - a real hot primer. The primer used was not identified. Case capacity as per Nosler data with 85 grain bullet & 64 grain bullet is 79%, lots of empty space.</p><p></p><p>My best <u>guess </u>is that a dreaded "detonation" event occurred as previously described. In addition, upon the "large bark" event, the case neck did not expand despite excessive pressure (100K psi ?). This might have been caused by excessive brass length. The mouth of the case was jammed into the chamber so tight expansion was prevented despite powder detonation pressure spike. </p><p></p><p>Possibly, case length grew upon several reloads when brass was head spaced on the belt and necks were jammed into chamber so tight expansion was prevented. The huge pressure spike should have expanded the neck.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 3027484, member: 115658"] W760 is a dense ball powder. Nosler load data for the .257 Wby has 64 gr W760 for 85 grain bullets & uses Fed 215 primers - a real hot primer. The primer used was not identified. Case capacity as per Nosler data with 85 grain bullet & 64 grain bullet is 79%, lots of empty space. My best [U]guess [/U]is that a dreaded "detonation" event occurred as previously described. In addition, upon the "large bark" event, the case neck did not expand despite excessive pressure (100K psi ?). This might have been caused by excessive brass length. The mouth of the case was jammed into the chamber so tight expansion was prevented despite powder detonation pressure spike. Possibly, case length grew upon several reloads when brass was head spaced on the belt and necks were jammed into chamber so tight expansion was prevented. The huge pressure spike should have expanded the neck. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Strange occurrence at the range today with handloads
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