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Rifles, Reloading, Optics, Equipment
Reloading
Hornady LNL OAL gauge question
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<blockquote data-quote="joe0121" data-source="post: 524169" data-attributes="member: 26058"><p>Do you have the bushing set so you can measure or the ogive instead of the tip? The shoulder should not affect your measurements. you are measuring from the base of the case to where the bullet touches the lands. This should be doable regardless of the shoulder. </p><p></p><p>The distance from the base of the case to the throat should never change(except for throat erosion obviously) just like the distance from the face of the bolt to the chamber should never change as it is fixed. Or should be Since your seater die does not touch the shoulder is will seat the bullet to a length in relationship to the base as it sits in the shell holder. As such when you chamber the round the base of the case sits on the bolt face and the bullet should be the same constant distance from the bolt face regardless of the shoulder. The only thing that changes is the head space. I did a little experiment I took a fire formed case and a brand new case that has only been annealed. I ran a Hornady 208GR Amax That I pre weighed to within .1 gr and measure to be within .006 in lenght. Seated a bullet in both and came up with a OAL that was exactly the same using my LNL bushings. The heads peace was .005 off as this is on a brand new barrel with 25 rounds down the tube.That error was likely me not having the case perfectly strait in my calipers. </p><p></p><p>Now taking your original measurement is a different story if you have a very loose chamber and the modified case goes in further that your once fire brass that has been fire formed. This would obviously affect the position of the base of the case as it is not being controlled by your bolt. FYI Hornady will modify your case for you, which they recommend VS using one of their modified cases.</p></blockquote><p></p>
[QUOTE="joe0121, post: 524169, member: 26058"] Do you have the bushing set so you can measure or the ogive instead of the tip? The shoulder should not affect your measurements. you are measuring from the base of the case to where the bullet touches the lands. This should be doable regardless of the shoulder. The distance from the base of the case to the throat should never change(except for throat erosion obviously) just like the distance from the face of the bolt to the chamber should never change as it is fixed. Or should be Since your seater die does not touch the shoulder is will seat the bullet to a length in relationship to the base as it sits in the shell holder. As such when you chamber the round the base of the case sits on the bolt face and the bullet should be the same constant distance from the bolt face regardless of the shoulder. The only thing that changes is the head space. I did a little experiment I took a fire formed case and a brand new case that has only been annealed. I ran a Hornady 208GR Amax That I pre weighed to within .1 gr and measure to be within .006 in lenght. Seated a bullet in both and came up with a OAL that was exactly the same using my LNL bushings. The heads peace was .005 off as this is on a brand new barrel with 25 rounds down the tube.That error was likely me not having the case perfectly strait in my calipers. Now taking your original measurement is a different story if you have a very loose chamber and the modified case goes in further that your once fire brass that has been fire formed. This would obviously affect the position of the base of the case as it is not being controlled by your bolt. FYI Hornady will modify your case for you, which they recommend VS using one of their modified cases. [/QUOTE]
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Hornady LNL OAL gauge question
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