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Another action blueprinting question ? bolt sleveing
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<blockquote data-quote="Mysticplayer" data-source="post: 113590" data-attributes="member: 8947"><p>JD, The concept is to hold the bolt in rigid alignment with the chamber/bore alignment when the sear falls.</p><p></p><p>Right now when you close your bolt, the hammer is held back by the trigger sear. This contact also elevates the bolt to some degree. Dry fire any action and you will see that the bolt moves just a smidge when the hammer falls.</p><p></p><p>BR shooters decided that that movement lead to inconsistent ignition or action harmonics thus reducing accuracy. The shims or Borden Bumps, keep the bolt in the same place before and after firing.</p><p></p><p>The vast majority of my rifles are rebarreled factory or surplus actions. Almost all would shoot in the 2's with the occasional group in the 1's. By todays short range BR standards, that is absolute crap but for hunters/varminters/plinkers better then most can shoot.</p><p></p><p>My basic requirement is 5 shots inside 1" at 250yds. Clays at 750yds. Then sub MOA at 1000m. This is a rifle that can be used all year rd in any weather. I have found most actions to easily meet my goals with good bullets/ammo, proper bedding and a reasonable barrel.</p><p></p><p>Except for competition, I see no need for more accuracy.</p><p></p><p>So again, back to the orig question and no, I would not put anything to limit reliability in the field in a 'working' rifle. That also applies to speedlock firing pin springs.</p><p></p><p>There is a reason Mr. Mauser kept the locktime relatively slow... it works.</p><p></p><p>Jerry</p></blockquote><p></p>
[QUOTE="Mysticplayer, post: 113590, member: 8947"] JD, The concept is to hold the bolt in rigid alignment with the chamber/bore alignment when the sear falls. Right now when you close your bolt, the hammer is held back by the trigger sear. This contact also elevates the bolt to some degree. Dry fire any action and you will see that the bolt moves just a smidge when the hammer falls. BR shooters decided that that movement lead to inconsistent ignition or action harmonics thus reducing accuracy. The shims or Borden Bumps, keep the bolt in the same place before and after firing. The vast majority of my rifles are rebarreled factory or surplus actions. Almost all would shoot in the 2's with the occasional group in the 1's. By todays short range BR standards, that is absolute crap but for hunters/varminters/plinkers better then most can shoot. My basic requirement is 5 shots inside 1" at 250yds. Clays at 750yds. Then sub MOA at 1000m. This is a rifle that can be used all year rd in any weather. I have found most actions to easily meet my goals with good bullets/ammo, proper bedding and a reasonable barrel. Except for competition, I see no need for more accuracy. So again, back to the orig question and no, I would not put anything to limit reliability in the field in a 'working' rifle. That also applies to speedlock firing pin springs. There is a reason Mr. Mauser kept the locktime relatively slow... it works. Jerry [/QUOTE]
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