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Rifles, Reloading, Optics, Equipment
Reloading
How to measure chamber depth to seat bullets?
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<blockquote data-quote="Bart B" data-source="post: 685826" data-attributes="member: 5302"><p>For what it's worth, note that one can get a more accurate length by not using the bolt at all.</p><p></p><p>Instead, seat a bullet slightly in a case neck with medium grip tension, then push the round into the chamber until it stops. That's where the case and bullet will be when the round fires. Use a rod down the barrel from the muzzle to push that round out without changing the bullet's location in the case neck. Pulling a round out with the extractor with a bullet so seated may let the case neck slip back a bit on the bullet. If the force is on the bullet, the case will stay in place on it. 'Course this assumes your case doesn't bind up anywhere in the chamber.</p><p></p><p>Do this with 5 cases but carefully measure the case head to the rifling contact point on the bullet and you'll see a spread of a few thousandths across all of them. That's the spread across your case headspace; exactly what happens for your ammo when the bolt's closed and round fired; the headspacing point on the case is hard against the same place in the chamber. The case head may or may not be against the bolt face when this happens.</p></blockquote><p></p>
[QUOTE="Bart B, post: 685826, member: 5302"] For what it's worth, note that one can get a more accurate length by not using the bolt at all. Instead, seat a bullet slightly in a case neck with medium grip tension, then push the round into the chamber until it stops. That's where the case and bullet will be when the round fires. Use a rod down the barrel from the muzzle to push that round out without changing the bullet's location in the case neck. Pulling a round out with the extractor with a bullet so seated may let the case neck slip back a bit on the bullet. If the force is on the bullet, the case will stay in place on it. 'Course this assumes your case doesn't bind up anywhere in the chamber. Do this with 5 cases but carefully measure the case head to the rifling contact point on the bullet and you'll see a spread of a few thousandths across all of them. That's the spread across your case headspace; exactly what happens for your ammo when the bolt's closed and round fired; the headspacing point on the case is hard against the same place in the chamber. The case head may or may not be against the bolt face when this happens. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
How to measure chamber depth to seat bullets?
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