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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 Lapua Improved 40 degree with print. Which design is better?
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<blockquote data-quote="Pdvdh" data-source="post: 1082957" data-attributes="member: 4191"><p>I'm not sure why your reamer spec sheet came with a larger dimension on the OD of the neck at the neck shoulder junction than at the case mouth. Question? <u>Are you going to ouside neck turn your case necks</u>?</p><p></p><p>I think the neck OD dimension "C" on your reamer spec sheet could/should be the same as dimension "H", 0.372", instead of 0.3744" & 0.37425". I went with 0.370" at both locations because I'll be truing up my case necks by outside case neck turning. Notice that the two reamer specs I added to your thread both use the same dimension of outside neck diameter at both locations of the neck - one at the shoulder joint and one at the case mouth.</p><p></p><p>The THROAT would basically increase the same amount as the increase in LEAD. Unless you decrease your outside neck diameter. Then the THROAT will be just an itsy bitsy bit less of an increase due to the decrease in outside neck diameter. Your reamer company should have a tech person that can talk to you and help you thru this also. I'm no expert. I figured out about what I wanted after determining a target COAL with my bullet of choice, and reviewing some other reamer spec sheets for reputable sources. I still relied on Dave Kiff (PTG) to ensure I wasn't making some sort of fatal error in my modified spec sheet. Dave talked with me once or twice briefly by phone.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1082957, member: 4191"] I'm not sure why your reamer spec sheet came with a larger dimension on the OD of the neck at the neck shoulder junction than at the case mouth. Question? [U]Are you going to ouside neck turn your case necks[/U]? I think the neck OD dimension "C" on your reamer spec sheet could/should be the same as dimension "H", 0.372", instead of 0.3744" & 0.37425". I went with 0.370" at both locations because I'll be truing up my case necks by outside case neck turning. Notice that the two reamer specs I added to your thread both use the same dimension of outside neck diameter at both locations of the neck - one at the shoulder joint and one at the case mouth. The THROAT would basically increase the same amount as the increase in LEAD. Unless you decrease your outside neck diameter. Then the THROAT will be just an itsy bitsy bit less of an increase due to the decrease in outside neck diameter. Your reamer company should have a tech person that can talk to you and help you thru this also. I'm no expert. I figured out about what I wanted after determining a target COAL with my bullet of choice, and reviewing some other reamer spec sheets for reputable sources. I still relied on Dave Kiff (PTG) to ensure I wasn't making some sort of fatal error in my modified spec sheet. Dave talked with me once or twice briefly by phone. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 Lapua Improved 40 degree with print. Which design is better?
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