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Rifles, Reloading, Optics, Equipment
Gunsmithing
Ogive vs lead angle
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<blockquote data-quote="J E Custom" data-source="post: 1082559" data-attributes="member: 2736"><p>There is no reason to try and match the Ojive to the lead angle, In fact it is better for them Not to match or pressures will rise. </p><p></p><p>Most lead angles are set by the designer of the cartridge for other reasons and normally from 1o</p><p>to 2.5 degrees. for best engraving the bullet uniformly.</p><p></p><p>Study some of the chamber drawings and you will see many variations but none intended to match the bullet Ojive.</p><p></p><p> <a href="https://www.google.com/search?q=ptg+reamer+drawings&sa=X&biw=1120&bih=501&tbm=isch&tbo=u&source=univ&ei=0QFOVYqpAYzGsAW6l4DIBA&ved=0CDIQ7Ak#imgrc=lfUjSweQ_EFMbM%253A%3B64xCDK_8EWIWHM%3Bhttp%253A%252F%252F4.bp.blogspot.com%252F_f1TTfqxVUw4%252FSvwWTC9J_MI%252FAAAAAAAAAqc%252FMSpo_dh0SNg%252Fs1600%252F30-06_Match_Fin_9685.jpg%3Bhttp%253A%252F%252Friflemansjournal.blogspot.com%252F2010%252F09%252Fbasics-leade-angle.html%3B1600%3B1266" target="_blank">https://www.google.com/search?q=ptg+reamer+drawings&sa=X&biw=1120&bih=501&tbm=isch&tbo=u&source=univ&ei=0QFOVYqpAYzGsAW6l4DIBA&ved=0CDIQ7Ak#imgrc=lfUjSweQ_EFMbM%3A;64xCDK_8EWIWHM;http%3A%2F%2F4.bp.blogspot.com%2F_f1TTfqxVUw4%2FSvwWTC9J_MI%2FAAAAAAAAAqc%2FMSpo_dh0SNg%2Fs1600%2F30-06_Match_Fin_9685.jpg;http%3A%2F%2Friflemansjournal.blogspot.com%2F2010%2F09%2Fbasics-leade-angle.html;1600;1266</a></p><p></p><p>For best barrel life, slower rates of fire, lower temperatures, frequent cleaning and wider lands all contribute to better barrel life. lead angle may have a small effect on it but it is immeasurable.</p><p></p><p>Matching the angle of the lead angle to the bullet would make the bullet impact the lead angle in its entirety and lead to higher pressures and poorer engraving of the bullet in my opinion.</p><p></p><p>This is just my opinion on lead angle.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1082559, member: 2736"] There is no reason to try and match the Ojive to the lead angle, In fact it is better for them Not to match or pressures will rise. Most lead angles are set by the designer of the cartridge for other reasons and normally from 1o to 2.5 degrees. for best engraving the bullet uniformly. Study some of the chamber drawings and you will see many variations but none intended to match the bullet Ojive. [url]https://www.google.com/search?q=ptg+reamer+drawings&sa=X&biw=1120&bih=501&tbm=isch&tbo=u&source=univ&ei=0QFOVYqpAYzGsAW6l4DIBA&ved=0CDIQ7Ak#imgrc=lfUjSweQ_EFMbM%253A%3B64xCDK_8EWIWHM%3Bhttp%253A%252F%252F4.bp.blogspot.com%252F_f1TTfqxVUw4%252FSvwWTC9J_MI%252FAAAAAAAAAqc%252FMSpo_dh0SNg%252Fs1600%252F30-06_Match_Fin_9685.jpg%3Bhttp%253A%252F%252Friflemansjournal.blogspot.com%252F2010%252F09%252Fbasics-leade-angle.html%3B1600%3B1266[/url] For best barrel life, slower rates of fire, lower temperatures, frequent cleaning and wider lands all contribute to better barrel life. lead angle may have a small effect on it but it is immeasurable. Matching the angle of the lead angle to the bullet would make the bullet impact the lead angle in its entirety and lead to higher pressures and poorer engraving of the bullet in my opinion. This is just my opinion on lead angle. J E CUSTOM [/QUOTE]
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