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Rifles, Reloading, Optics, Equipment
Gunsmithing
Custom reamer for 7 Rem Mag and 195 Berger, any thoughts? 5/28 Chamber drawing added
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<blockquote data-quote="Alex Wheeler" data-source="post: 1915410" data-attributes="member: 101859"><p>See the scuff marks left on the neck from your neck bushing? See where they stop? Below that is unsized neck. The junction of the shank of the bullet and the boat tail is where the pressure ring forms on a bullet. Its usually a few ten thousandths larger than the rest of the shank. It acts like and expander mandrel when you seat a bullet. If you push it through the sized part of the neck, you loose control of neck tension. That doesnt mean it wont shoot. But, ideally if its possible, I like to keep the pressure ring in the sized part of the neck at the farthest jump you may use. Keep in mind different bullets have very different bearing surface lengths, for example a 175 lrab needs .050" more freebore than a 180 hybrid. Its hard to get a reamer to do it all, thats why I end up with so many.</p></blockquote><p></p>
[QUOTE="Alex Wheeler, post: 1915410, member: 101859"] See the scuff marks left on the neck from your neck bushing? See where they stop? Below that is unsized neck. The junction of the shank of the bullet and the boat tail is where the pressure ring forms on a bullet. Its usually a few ten thousandths larger than the rest of the shank. It acts like and expander mandrel when you seat a bullet. If you push it through the sized part of the neck, you loose control of neck tension. That doesnt mean it wont shoot. But, ideally if its possible, I like to keep the pressure ring in the sized part of the neck at the farthest jump you may use. Keep in mind different bullets have very different bearing surface lengths, for example a 175 lrab needs .050" more freebore than a 180 hybrid. Its hard to get a reamer to do it all, thats why I end up with so many. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
Custom reamer for 7 Rem Mag and 195 Berger, any thoughts? 5/28 Chamber drawing added
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