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<blockquote data-quote="Coyote Shadow Tracker" data-source="post: 2193963" data-attributes="member: 116439"><p>First of all has this problem just started or has it always been a problem? What is the PROBLEM to say that you need to "Bush" the firing pin and who recommended it? I assume that this is a Remington. Remington has had several owners in th past few ears. I would check there first for a warrenty coverage. You have to diagnose the problem. I did some reasearch and read this first before doing anyhting else.</p><p>Before cutting any metal (or melting any, either), determine why the strike is off center. It may have nothing to do with the firing pin hole being off center, which is the only error that messing with the firing pin hole will correct.</p><p></p><p>Try this procedure. Take a fired case that does not have asymmetrical expansion and drive out the dead primer with a punch (DO NOT full length resize the case to remove the primer, we want an expanded case to do this experiment with.) Seat a new primer in the case and then fire it in the gun. Examine the firing pin hit on the case for concentricity. If it is close enough, your problem is the small case/large chamber problem which may be cured by neck sizing your cases instead of full length sizing. If you use only factory ammo, you are out of luck unless you want to rebarrel with a minimum chamber.</p><p></p><p>There are other potential misalignment problems that might cause off center primer hits. The barrel threads might not be concentric with the bore; the receiver threads might not be concentric with the bolt; the bolt may be undersize for the receiver (loose in the receiver), chamber may not be aligned with the bore.</p><p></p><p>Normally a firing pin hole is bushed, or welded and redrilled, only if it is too big and you are getting primer material extruded back around the firing pin. If I had to do it I would heavily heat sink the bolt head while holding it vertically in a vise, and with a TIG welder, quickly puddle the firing pin hole and stick some filler in the puddle. Then turn off the current and let things cool. Properly done, this will not affect the heat treatment of the lugs. Then center in the four jaw and center drill and drill to your desired hole diameter.</p><p></p><p>But frankly, unless you are having misfire problems or inaccuracy attributable to inconsistent ignition (highly variable velocities as measured with an accurate chronograph), You should not worry about it. It is too complicated and expensive to correct if the cause is not an off-center firing pin hole.</p><p></p><p>Thanks</p><p>Len & Jill</p></blockquote><p></p>
[QUOTE="Coyote Shadow Tracker, post: 2193963, member: 116439"] First of all has this problem just started or has it always been a problem? What is the PROBLEM to say that you need to "Bush" the firing pin and who recommended it? I assume that this is a Remington. Remington has had several owners in th past few ears. I would check there first for a warrenty coverage. You have to diagnose the problem. I did some reasearch and read this first before doing anyhting else. Before cutting any metal (or melting any, either), determine why the strike is off center. It may have nothing to do with the firing pin hole being off center, which is the only error that messing with the firing pin hole will correct. Try this procedure. Take a fired case that does not have asymmetrical expansion and drive out the dead primer with a punch (DO NOT full length resize the case to remove the primer, we want an expanded case to do this experiment with.) Seat a new primer in the case and then fire it in the gun. Examine the firing pin hit on the case for concentricity. If it is close enough, your problem is the small case/large chamber problem which may be cured by neck sizing your cases instead of full length sizing. If you use only factory ammo, you are out of luck unless you want to rebarrel with a minimum chamber. There are other potential misalignment problems that might cause off center primer hits. The barrel threads might not be concentric with the bore; the receiver threads might not be concentric with the bolt; the bolt may be undersize for the receiver (loose in the receiver), chamber may not be aligned with the bore. Normally a firing pin hole is bushed, or welded and redrilled, only if it is too big and you are getting primer material extruded back around the firing pin. If I had to do it I would heavily heat sink the bolt head while holding it vertically in a vise, and with a TIG welder, quickly puddle the firing pin hole and stick some filler in the puddle. Then turn off the current and let things cool. Properly done, this will not affect the heat treatment of the lugs. Then center in the four jaw and center drill and drill to your desired hole diameter. But frankly, unless you are having misfire problems or inaccuracy attributable to inconsistent ignition (highly variable velocities as measured with an accurate chronograph), You should not worry about it. It is too complicated and expensive to correct if the cause is not an off-center firing pin hole. Thanks Len & Jill [/QUOTE]
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