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Rifles, Reloading, Optics, Equipment
Reloading
Concentricity/Neck Turning/Culling Cases:
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<blockquote data-quote="sedancowboy" data-source="post: 1644540" data-attributes="member: 85874"><p>So let me get this straight in my mind. You have 300 Rem 300 Rum cases and 100 Rem 300 WM cases + 300 loaded cartridges from Berger? What cases do Berger use? Since they are part of the group I would assume they use Lapua if it is available. Lapua does not make 300 WM. If I understand correctly this is a nightmare in the making. What Berger loaded ammo do you have coming is it all for 300 RUM or 300 WM or some of both? You could have several brands of brass when it is all said and done. Pick one brand for each cartridge and stick with it. </p><p>Now to your question I would expand and then turn each case. I turn only until I have cleaned up about 80-90% of the case neck. Or in the case of too thick necks I turn to about .014-.015 that seems to be a good thickness for most bushing dies and chambers. next I would load a med load and shoot them to fire form them to your chamber. Now measure the runout on the neck and see where you are at. If your chamber is concentric you are golden. Now as you reload your fire formed case measure after each step and see if you can maintain the same runout as your fired case.</p><p>If not you have some work to do. I use a bushing die with no expander inside. If my necks are the same thickness them I don't need to expand before seating a bullet. How you seat the bullet can have a major impact on how concentric your ammo will be. I rotate the cartridge as I seat the bullet in steps. No less than two start the bullet and raise the handle and rotate the case 180 degrees and finish seating you can rotate and seat more times if you like.</p><p>Good luck the search engine is your friend and this subject has been discussed many many times.</p></blockquote><p></p>
[QUOTE="sedancowboy, post: 1644540, member: 85874"] So let me get this straight in my mind. You have 300 Rem 300 Rum cases and 100 Rem 300 WM cases + 300 loaded cartridges from Berger? What cases do Berger use? Since they are part of the group I would assume they use Lapua if it is available. Lapua does not make 300 WM. If I understand correctly this is a nightmare in the making. What Berger loaded ammo do you have coming is it all for 300 RUM or 300 WM or some of both? You could have several brands of brass when it is all said and done. Pick one brand for each cartridge and stick with it. Now to your question I would expand and then turn each case. I turn only until I have cleaned up about 80-90% of the case neck. Or in the case of too thick necks I turn to about .014-.015 that seems to be a good thickness for most bushing dies and chambers. next I would load a med load and shoot them to fire form them to your chamber. Now measure the runout on the neck and see where you are at. If your chamber is concentric you are golden. Now as you reload your fire formed case measure after each step and see if you can maintain the same runout as your fired case. If not you have some work to do. I use a bushing die with no expander inside. If my necks are the same thickness them I don't need to expand before seating a bullet. How you seat the bullet can have a major impact on how concentric your ammo will be. I rotate the cartridge as I seat the bullet in steps. No less than two start the bullet and raise the handle and rotate the case 180 degrees and finish seating you can rotate and seat more times if you like. Good luck the search engine is your friend and this subject has been discussed many many times. [/QUOTE]
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Concentricity/Neck Turning/Culling Cases:
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