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Rifles, Reloading, Optics, Equipment
Reloading
Let's talk about the "dreaded donut"
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<blockquote data-quote="hammertyme" data-source="post: 485645" data-attributes="member: 12863"><p>I have experienced that donut in a drastic application a couple of times. many years ago I wanted an Rimmed 06/30 Gibbs case so purchased some RWS 9.3 X 74 brass and trimmed it to length.</p><p> </p><p>In trimming it to length and then the stepping down to 30 caliber the brass in the body/shoulder area of all cases is much thicker. So mechanically and prior to firing one has formed a smaller dimension (donut) just because that is what happens with that thick part of the case. With a high energy cartridge like the Gibbs one uses load data published for the 30 Gibbs when one may very well have a 284 diameter inside that case. As one shoots and the case forms to the chamber more material swells in that area further decreasing that area.</p><p> </p><p>Yes I saw my pressures spike after a brief period of time and when checking I pinned a 6.5 diameter (roughly) and I was loading for a 30 caliber. So yes that donut is a pain but it is also very dangerous if one doen't know it is there. I have cutters and just ream the donut out. It will come back so I switched cases to 7X65R and never saw another donut again.</p><p> </p><p>I am currently working with the 5.6 X 57 RWS case and the neck of that case is extremely thick. I am waiting for tooling so I can turn down the neck/shoulder area in hopes of avoiding the pain in the butt donut. There is such a drastic thickness I will need to turn down the outside and after forming the case I will ream the inside.</p><p> </p><p>The reason I would go through something like this is because the RWS case are the toughest cases I have ever used. Quality is as good as it gets and they use to cost a buck a case. Years ago I purchased a life time supply of different RWS cases and haven't lost a case yet. They are as tough as a WSM case without being brittle.</p><p> </p><p>For those interested, Huntingtons is the only company I know of currently importing RWS case's.</p><p> </p><p>Neal</p></blockquote><p></p>
[QUOTE="hammertyme, post: 485645, member: 12863"] I have experienced that donut in a drastic application a couple of times. many years ago I wanted an Rimmed 06/30 Gibbs case so purchased some RWS 9.3 X 74 brass and trimmed it to length. In trimming it to length and then the stepping down to 30 caliber the brass in the body/shoulder area of all cases is much thicker. So mechanically and prior to firing one has formed a smaller dimension (donut) just because that is what happens with that thick part of the case. With a high energy cartridge like the Gibbs one uses load data published for the 30 Gibbs when one may very well have a 284 diameter inside that case. As one shoots and the case forms to the chamber more material swells in that area further decreasing that area. Yes I saw my pressures spike after a brief period of time and when checking I pinned a 6.5 diameter (roughly) and I was loading for a 30 caliber. So yes that donut is a pain but it is also very dangerous if one doen't know it is there. I have cutters and just ream the donut out. It will come back so I switched cases to 7X65R and never saw another donut again. I am currently working with the 5.6 X 57 RWS case and the neck of that case is extremely thick. I am waiting for tooling so I can turn down the neck/shoulder area in hopes of avoiding the pain in the butt donut. There is such a drastic thickness I will need to turn down the outside and after forming the case I will ream the inside. The reason I would go through something like this is because the RWS case are the toughest cases I have ever used. Quality is as good as it gets and they use to cost a buck a case. Years ago I purchased a life time supply of different RWS cases and haven't lost a case yet. They are as tough as a WSM case without being brittle. For those interested, Huntingtons is the only company I know of currently importing RWS case's. Neal [/QUOTE]
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Reloading
Let's talk about the "dreaded donut"
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