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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
SHERMAN MEGA LINE
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<blockquote data-quote="brittf" data-source="post: 2431989" data-attributes="member: 121792"><p>Thank you for the reply. I appreciate the information and taking the time to respond.</p><p></p><p>I tend to be overly analytical on engineering design questions. So, I generally draw everything out in excruciating detail and avoid rules-of-thumb. It probably annoys the people around me, but my students generally like the precision. At this point in my life (59 years old), I suspect I am stuck with that aspect of my personality <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>As an example, I am about to chamber a 28" Proof Barrel for my 300 Win Mag. Attached is my working drawing. It shows exactly how I will first use a JGS SAAMI Chamber Reamer and then follow up with a JGS Throating Reamer to get an explicit jump with a specific bullet. There are no estimates or rules-of-thumb in the drawing.</p><p></p><p>So, I really WASN'T kidding when I said that I had drawn out the 7mm Sherman MEGA chamber in complete detail. I have made similar drawings for the 7mm Sherman Max, 7mm Sherman Mega, 280 Sherman, and 28 Sherman Magnum. I evaluated each of them against a variety of bullets and looked at the resulting jump, bearing engagement length, magazine fit, and protrusion into the powder column. Any error in my prior posts was because I misunderstood the data I had access to (long-action versus short-action) and not because I was sloppy or didn't know what I was doing.</p></blockquote><p></p>
[QUOTE="brittf, post: 2431989, member: 121792"] Thank you for the reply. I appreciate the information and taking the time to respond. I tend to be overly analytical on engineering design questions. So, I generally draw everything out in excruciating detail and avoid rules-of-thumb. It probably annoys the people around me, but my students generally like the precision. At this point in my life (59 years old), I suspect I am stuck with that aspect of my personality :) As an example, I am about to chamber a 28" Proof Barrel for my 300 Win Mag. Attached is my working drawing. It shows exactly how I will first use a JGS SAAMI Chamber Reamer and then follow up with a JGS Throating Reamer to get an explicit jump with a specific bullet. There are no estimates or rules-of-thumb in the drawing. So, I really WASN'T kidding when I said that I had drawn out the 7mm Sherman MEGA chamber in complete detail. I have made similar drawings for the 7mm Sherman Max, 7mm Sherman Mega, 280 Sherman, and 28 Sherman Magnum. I evaluated each of them against a variety of bullets and looked at the resulting jump, bearing engagement length, magazine fit, and protrusion into the powder column. Any error in my prior posts was because I misunderstood the data I had access to (long-action versus short-action) and not because I was sloppy or didn't know what I was doing. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
SHERMAN MEGA LINE
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