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Rifles, Reloading, Optics, Equipment
Reloading
Coal or ogive
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<blockquote data-quote="Aussie Hunter Steve" data-source="post: 707088" data-attributes="member: 53311"><p>The only real justifications for being concerned with COAL is;</p><p>1. that the cartridge must be short enough to fit into the magazine and feed properly</p><p>2. that the bullet is seated deep enough to be held securely in the case neck.</p><p></p><p>If these criteria are met there is often an accuracy advantage when having the bullet seated close to the rifling lands. </p><p>A simple method is to seat a bullet approx caliber depth into an empty resized case (satisfying #2 above) and chamber the round. As the cartridge is chambered slowly the bullet hits against the lands. You will feel the resistance as you gently push the bolt home and close it down. The lands will usually seat the bullet deeper into the case. Then remove your 'test round' which shows the seating depth for that particular bullet to hit the lands. This 'test round can be put back into the reloading press and the seating die turned down to contact the bullet. Next, turn the seating die down slightly more to seat the bullet a little off the lands. Take the 'test load' now, and with a permanent marking texta, colour the bullet all around in the area where it will first contact the rifling. Chamber the 'test load' again and upon extraction look for any rifling imprints in the texta colour. If there are none you have clearance. Many rifles shoot their best when seated so that the rifling will just imprint the texta yet not mark the bullet. This process needs to be repeated for each bullet you try. Good luck!</p></blockquote><p></p>
[QUOTE="Aussie Hunter Steve, post: 707088, member: 53311"] The only real justifications for being concerned with COAL is; 1. that the cartridge must be short enough to fit into the magazine and feed properly 2. that the bullet is seated deep enough to be held securely in the case neck. If these criteria are met there is often an accuracy advantage when having the bullet seated close to the rifling lands. A simple method is to seat a bullet approx caliber depth into an empty resized case (satisfying #2 above) and chamber the round. As the cartridge is chambered slowly the bullet hits against the lands. You will feel the resistance as you gently push the bolt home and close it down. The lands will usually seat the bullet deeper into the case. Then remove your 'test round' which shows the seating depth for that particular bullet to hit the lands. This 'test round can be put back into the reloading press and the seating die turned down to contact the bullet. Next, turn the seating die down slightly more to seat the bullet a little off the lands. Take the 'test load' now, and with a permanent marking texta, colour the bullet all around in the area where it will first contact the rifling. Chamber the 'test load' again and upon extraction look for any rifling imprints in the texta colour. If there are none you have clearance. Many rifles shoot their best when seated so that the rifling will just imprint the texta yet not mark the bullet. This process needs to be repeated for each bullet you try. Good luck! [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Coal or ogive
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