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Rifles, Reloading, Optics, Equipment
Reloading
bulging at the base of the neck in a 243 win
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<blockquote data-quote="MNbogboy" data-source="post: 1530059" data-attributes="member: 18849"><p>Tree farmer,</p><p>Yours sounds like typical "donut". Hard chambering on loaded rounds can possibly drive up your pressures.</p><p> My fix for this has been to ream before sizing and after sizing with 2 different reamers.</p><p>You will have to measure your brass just inside the neck at both stages to determine reamer sizes.</p><p>This has worked for me on one of my 257 Bob A.I.s and my 6.5/257 Bob A.I.s as well as one 260 I had.</p><p>The donuts on the Bobs were caused by being formed from longer (270) brass. The 260 donuts I believe were caused by mixing neck sizing and full length sizing.</p><p>Donut formation seems to dissipate with seasoned brass. Annealing often may accelerate it.</p><p>Imho,</p><p>Randy</p></blockquote><p></p>
[QUOTE="MNbogboy, post: 1530059, member: 18849"] Tree farmer, Yours sounds like typical "donut". Hard chambering on loaded rounds can possibly drive up your pressures. My fix for this has been to ream before sizing and after sizing with 2 different reamers. You will have to measure your brass just inside the neck at both stages to determine reamer sizes. This has worked for me on one of my 257 Bob A.I.s and my 6.5/257 Bob A.I.s as well as one 260 I had. The donuts on the Bobs were caused by being formed from longer (270) brass. The 260 donuts I believe were caused by mixing neck sizing and full length sizing. Donut formation seems to dissipate with seasoned brass. Annealing often may accelerate it. Imho, Randy [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
bulging at the base of the neck in a 243 win
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