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Rifles, Reloading, Optics, Equipment
Reloading
How do I find the lands?
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<blockquote data-quote="Mikecr" data-source="post: 537704" data-attributes="member: 1521"><p>I didn't like the Sinclair tool, or the Hornady/Stoney point approach for similar reasons.</p><p>The Sinclair tool takes measure from a loose collar/dummy bolt that will not set flush in actions(due to their extractrion ramp). They also seemed to miss the concept that a bolt handle is not what holds a bolt in place.</p><p>Both tools leave you averaging because they don't actually represent the boltface, but the back of a case w/resp to it's shoulder stopping in the chamber. We already have bullet nose angles to mess with things, and we don't do better adding shoulder angles as well.</p><p>If 5 people used these tools with 5 different guns, they would not produce consistent results.</p><p></p><p>A rod from the muzzle gives you bullet tip to actual boltface. It doesn't have to be averaged.</p><p>With this, you seat THAT bullet in any case until the COAL matches your measurement. Then you find it's OgvOAL with a suitable tool of your choice (just always use that tool). LOG IT</p><p></p><p>No matter the method, on firing, the ogive will hold w/resp to shoulder seating (especially if loaded off the lands). So it's another reason headspace should be carefully controlled.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 537704, member: 1521"] I didn't like the Sinclair tool, or the Hornady/Stoney point approach for similar reasons. The Sinclair tool takes measure from a loose collar/dummy bolt that will not set flush in actions(due to their extractrion ramp). They also seemed to miss the concept that a bolt handle is not what holds a bolt in place. Both tools leave you averaging because they don't actually represent the boltface, but the back of a case w/resp to it's shoulder stopping in the chamber. We already have bullet nose angles to mess with things, and we don't do better adding shoulder angles as well. If 5 people used these tools with 5 different guns, they would not produce consistent results. A rod from the muzzle gives you bullet tip to actual boltface. It doesn't have to be averaged. With this, you seat THAT bullet in any case until the COAL matches your measurement. Then you find it's OgvOAL with a suitable tool of your choice (just always use that tool). LOG IT No matter the method, on firing, the ogive will hold w/resp to shoulder seating (especially if loaded off the lands). So it's another reason headspace should be carefully controlled. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
How do I find the lands?
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