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Rifles, Reloading, Optics, Equipment
Gunsmithing
Muzzle Crown
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<blockquote data-quote="sable tireur" data-source="post: 1445642" data-attributes="member: 27307"><p><strong>Factory or custom barrel? Button or cut?</strong></p><p></p><p><strong>What is the cartridge?</strong></p><p></p><p>Small capacity cartridges like the 6mmBR can outlast 2,000 rounds fired. A 300 RUM will not.</p><p></p><p><strong>How do you clean the barrel and how often?</strong></p><p><strong></strong></p><p>Aggressive cleaning with stainless brushes can and will ruin a crown necessitating a freshening of that crown.</p><p></p><p><strong>Can you document the loss of accuracy attributable to the crown?</strong></p><p></p><p>Was the loss from one minute to the next, or have you seen a slight degradation over a period of time? Examine the crown under magnification to see if there is degradation or a small ding which might contribute to inaccuracy.</p><p></p><p><strong>Have you chased the lands or adjusted your load for a lengthening of the throat?</strong></p><p><strong></strong></p><p>There are lots of questions to be asked and answered before you just whack off an inch of your barrel for a new crown. If the throat is burned out for a couple of inches, it might be time for a new barrel. If the throat has advanced a little bit, maybe a set back is in order or you need to adjust your seating depth. A new crown is a simple solution and relatively inexpensive by comparison but if you need other work done without doing the crown, why bother?</p></blockquote><p></p>
[QUOTE="sable tireur, post: 1445642, member: 27307"] [B]Factory or custom barrel? Button or cut?[/B] [B]What is the cartridge?[/B] Small capacity cartridges like the 6mmBR can outlast 2,000 rounds fired. A 300 RUM will not. [B]How do you clean the barrel and how often? [/B] Aggressive cleaning with stainless brushes can and will ruin a crown necessitating a freshening of that crown. [B]Can you document the loss of accuracy attributable to the crown?[/B] Was the loss from one minute to the next, or have you seen a slight degradation over a period of time? Examine the crown under magnification to see if there is degradation or a small ding which might contribute to inaccuracy. [B]Have you chased the lands or adjusted your load for a lengthening of the throat? [/B] There are lots of questions to be asked and answered before you just whack off an inch of your barrel for a new crown. If the throat is burned out for a couple of inches, it might be time for a new barrel. If the throat has advanced a little bit, maybe a set back is in order or you need to adjust your seating depth. A new crown is a simple solution and relatively inexpensive by comparison but if you need other work done without doing the crown, why bother? [/QUOTE]
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