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Rifles, Reloading, Optics, Equipment
Gunsmithing
blueprinting 700 action
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<blockquote data-quote="J E Custom" data-source="post: 676511" data-attributes="member: 2736"><p>Lots of good advice. I will add my 2 cents for what it's worth.</p><p></p><p>Any "good" action can be blue printed and made to be very accurate.</p><p></p><p>Replacing the bolt is common when you have to do extensive modifications to</p><p>make it work with the cartrige of your choice or it is simply wore out.</p><p></p><p>All actions, whether custom or factory are CNC machined and the trueness and tolerances</p><p>will vary depending on the setup and quality control acceptance. I have found both custom </p><p>and factory actions to be almost perfict and found some of both to be not so perfict and in </p><p>need of some truing.</p><p></p><p>The clearance between the bolt and the raceway Is subjective and each person has there </p><p>opinion on how much is to much and how much is to little.</p><p></p><p>If the bolt is to loose, the bolt sear will not be as consistant. If it is to tight it will bind in </p><p>some cases and be difficult to operate fast or in an emergency. So there is a range that works</p><p>well and has little or no effect on accuracy.</p><p></p><p>With everything as true and square the important thing now is the chamber and head space.</p><p>If the cartrige can move upon firing because of excessive head space accuracy can be affected.</p><p></p><p>So the accuracy is dependent on many things that have to come together at the same time </p><p>and the action is just one of those componants and it should be true and square.</p><p></p><p>One of the most accurate rifles that I have ever owned was built on a 98 Mauser action that</p><p>had so much clearance between the bolt and the race ways that after ejection you had to lift </p><p>up on it to keep it from binding when chambering the next round. This rifle was used for 1000 </p><p>yard competition and would consistantly hold better than 1/2 MOA at 1000 yards. It had a </p><p>perfict chamber and head space, and was very true when made up on properly sized ammo.</p><p></p><p>So do you have to buy a new bolt ? NO </p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 676511, member: 2736"] Lots of good advice. I will add my 2 cents for what it's worth. Any "good" action can be blue printed and made to be very accurate. Replacing the bolt is common when you have to do extensive modifications to make it work with the cartrige of your choice or it is simply wore out. All actions, whether custom or factory are CNC machined and the trueness and tolerances will vary depending on the setup and quality control acceptance. I have found both custom and factory actions to be almost perfict and found some of both to be not so perfict and in need of some truing. The clearance between the bolt and the raceway Is subjective and each person has there opinion on how much is to much and how much is to little. If the bolt is to loose, the bolt sear will not be as consistant. If it is to tight it will bind in some cases and be difficult to operate fast or in an emergency. So there is a range that works well and has little or no effect on accuracy. With everything as true and square the important thing now is the chamber and head space. If the cartrige can move upon firing because of excessive head space accuracy can be affected. So the accuracy is dependent on many things that have to come together at the same time and the action is just one of those componants and it should be true and square. One of the most accurate rifles that I have ever owned was built on a 98 Mauser action that had so much clearance between the bolt and the race ways that after ejection you had to lift up on it to keep it from binding when chambering the next round. This rifle was used for 1000 yard competition and would consistantly hold better than 1/2 MOA at 1000 yards. It had a perfict chamber and head space, and was very true when made up on properly sized ammo. So do you have to buy a new bolt ? NO J E CUSTOM [/QUOTE]
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blueprinting 700 action
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