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Rifles, Reloading, Optics, Equipment
Reloading
Let's talk about the "dreaded donut"
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<blockquote data-quote="SBruce" data-source="post: 485819" data-attributes="member: 21068"><p>Thank you all for the responses.</p><p> </p><p>After reading them, I can visualize how donuts may occasionally form from firing and case stretch/brass flow. I experienced alot of brass flow and stretch with a 220 Swift, but I never pin guaged the neck ID to know if I had donuts forming or not.? I didn't however notice any loss of precision or opening of groups until the barrel was getting pretty long in the tooth. But I neck sized (and only partial) most of the time, only FL sizing and trimming about every 3rd fireing. Perhaps that helped, guess I'll never know for sure. The Swift has alot of body taper in addition to a lesser shoulder angle. More prone to stretching/flowing even over the 30-06 IMO.</p><p> </p><p>Mikecr, your comments are making alot of sense too, and are along the lines of what I was originally thinking. Kinda confirming that donuts are also occasionally created by the sizing process used. I have certainly noticed longer cases when FL sizing, even longer still when FL sizing with an expander ball.</p><p> </p><p>My latest wildcat is a 6 Long Dasher, formed by necking down from 6.5X47 Lapua, then further formed into a longer body with a 40 degree shoulder once fired. So far, my knowledge of this wildcat is limited because I've only loaded and fired one case 12 times, and another case 3 times. I took multiple measurements (OD's and lengths in multiple spots) after every fireing/charge increase. I increased the charge 1/2 grn at a time until I found absolute max charge and consequently ruined the case. I saw absolutely no lengthening of the case during the process.............kinda confirming that sharper shoulder angles stretch less upon being fired. </p><p> </p><p>If I am understanding you all correctly, the only way to remove the donut if one should arrive, is to ream the ID of the neck? </p><p> </p><p>I used to read and hear that inside neck reaming creates it's own problems/issues so I've never done it. Any comments on that?</p></blockquote><p></p>
[QUOTE="SBruce, post: 485819, member: 21068"] Thank you all for the responses. After reading them, I can visualize how donuts may occasionally form from firing and case stretch/brass flow. I experienced alot of brass flow and stretch with a 220 Swift, but I never pin guaged the neck ID to know if I had donuts forming or not.? I didn't however notice any loss of precision or opening of groups until the barrel was getting pretty long in the tooth. But I neck sized (and only partial) most of the time, only FL sizing and trimming about every 3rd fireing. Perhaps that helped, guess I'll never know for sure. The Swift has alot of body taper in addition to a lesser shoulder angle. More prone to stretching/flowing even over the 30-06 IMO. Mikecr, your comments are making alot of sense too, and are along the lines of what I was originally thinking. Kinda confirming that donuts are also occasionally created by the sizing process used. I have certainly noticed longer cases when FL sizing, even longer still when FL sizing with an expander ball. My latest wildcat is a 6 Long Dasher, formed by necking down from 6.5X47 Lapua, then further formed into a longer body with a 40 degree shoulder once fired. So far, my knowledge of this wildcat is limited because I've only loaded and fired one case 12 times, and another case 3 times. I took multiple measurements (OD's and lengths in multiple spots) after every fireing/charge increase. I increased the charge 1/2 grn at a time until I found absolute max charge and consequently ruined the case. I saw absolutely no lengthening of the case during the process.............kinda confirming that sharper shoulder angles stretch less upon being fired. If I am understanding you all correctly, the only way to remove the donut if one should arrive, is to ream the ID of the neck? I used to read and hear that inside neck reaming creates it's own problems/issues so I've never done it. Any comments on that? [/QUOTE]
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Reloading
Let's talk about the "dreaded donut"
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