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Rifles, Reloading, Optics, Equipment
Gunsmithing
factory ackley Improved
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<blockquote data-quote="sable tireur" data-source="post: 959631" data-attributes="member: 27307"><p>J E Custom,</p><p></p><p>There is no reason to apologize for disagreeing. That's how many questions get resolved in the long run. I realize that the forum regulars often view new members with low post counts as lacking experience and knowledge, which in this situation is a mis-characterization. After advanced work in physics and ballistics and 30 years in gunsmithing designing and custom building rifles, it is not unusual for me to still find some folks who seem to have this nomenclature thing a little backward. </p><p></p><p>The information as you relate it to this question is incorrect. Please take a look at the PTG reamer print below and notice where the term 'LEAD' (LEADE really) is placed. Then take a look at where the area is marked 'Throat'.</p><p></p><p>It is the throat which has the angle since this is the area of the chamber where the bullet is funneled into the bore/grooves of the barrel. The angle can vary from a little less than 1 degree up to about 3 degree.</p><p></p><p>The LEADE is the straight walled, cylindrical portion of the chamber which is found right in front of that 45 degree angle referred to as the transition angle for a good reason. It reduces the size of the chamber down from the neck diameter to the LEADE diameter. The LEADE is approximately 0.0005" larger in diameter than the bullet.</p><p></p><p>This misunderstanding can often be traced to discussions involving Weatherby cartridges where the term 'free bore' was substituted for the correct term, LEADE.</p><p></p><p></p><p><img src="http://i165.photobucket.com/albums/u64/nesikachad/95p.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="sable tireur, post: 959631, member: 27307"] J E Custom, There is no reason to apologize for disagreeing. That's how many questions get resolved in the long run. I realize that the forum regulars often view new members with low post counts as lacking experience and knowledge, which in this situation is a mis-characterization. After advanced work in physics and ballistics and 30 years in gunsmithing designing and custom building rifles, it is not unusual for me to still find some folks who seem to have this nomenclature thing a little backward. The information as you relate it to this question is incorrect. Please take a look at the PTG reamer print below and notice where the term 'LEAD' (LEADE really) is placed. Then take a look at where the area is marked 'Throat'. It is the throat which has the angle since this is the area of the chamber where the bullet is funneled into the bore/grooves of the barrel. The angle can vary from a little less than 1 degree up to about 3 degree. The LEADE is the straight walled, cylindrical portion of the chamber which is found right in front of that 45 degree angle referred to as the transition angle for a good reason. It reduces the size of the chamber down from the neck diameter to the LEADE diameter. The LEADE is approximately 0.0005" larger in diameter than the bullet. This misunderstanding can often be traced to discussions involving Weatherby cartridges where the term 'free bore' was substituted for the correct term, LEADE. [IMG]http://i165.photobucket.com/albums/u64/nesikachad/95p.jpg[/IMG] [/QUOTE]
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