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Rifles, Reloading, Optics, Equipment
Reloading
Brass much thicker right by neck?
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<blockquote data-quote="greenejc" data-source="post: 1640155" data-attributes="member: 60453"><p>No, free bore is the area between the end of the chamber and the point where the bullet engages the rifling. It can be long or short depending on the barrel manufacturer. A longer free bore lets bullets be seated out farther in the casing without effecting pressures. A shorter free bore lets lighter or shorter bullets be seated nearer to the rifling in the barrel. The chamber of a 30-06 for example has a final diameter the size of the neck of the cartridge or slightly larger, at 0.3397 to maybe 0.3399. The Free bore is reamed to 0.308-0.3085 and varies in length. But it always is made to allow the cartridge to chamber with the bullet short of the rifling. If you reload, you don't want to seat bullets so far forward that they can contact the rifling, either. It will cause excessive pressure with what should be safe loads. For instance, Barnes recommends a seating depth which puts their X bullets about 0.050 away from the lands. A tight free bore is used in a match grade barrel to help allign the centerline of the bullet with the centerline of the bore. Commercial barrels are made with a little leeway for reliable function/feeding/extraction. If you are reloading, make sure you measure your free bore and seat the bullet a couple of hundreths away from the lands at least. It won't really effect your rifle's practical accuracy, and it will keep you from locking up an action due to an overpressure spike. The brass thickening at the neck is a case length problem, I think. Hope that answers your question.</p></blockquote><p></p>
[QUOTE="greenejc, post: 1640155, member: 60453"] No, free bore is the area between the end of the chamber and the point where the bullet engages the rifling. It can be long or short depending on the barrel manufacturer. A longer free bore lets bullets be seated out farther in the casing without effecting pressures. A shorter free bore lets lighter or shorter bullets be seated nearer to the rifling in the barrel. The chamber of a 30-06 for example has a final diameter the size of the neck of the cartridge or slightly larger, at 0.3397 to maybe 0.3399. The Free bore is reamed to 0.308-0.3085 and varies in length. But it always is made to allow the cartridge to chamber with the bullet short of the rifling. If you reload, you don't want to seat bullets so far forward that they can contact the rifling, either. It will cause excessive pressure with what should be safe loads. For instance, Barnes recommends a seating depth which puts their X bullets about 0.050 away from the lands. A tight free bore is used in a match grade barrel to help allign the centerline of the bullet with the centerline of the bore. Commercial barrels are made with a little leeway for reliable function/feeding/extraction. If you are reloading, make sure you measure your free bore and seat the bullet a couple of hundreths away from the lands at least. It won't really effect your rifle's practical accuracy, and it will keep you from locking up an action due to an overpressure spike. The brass thickening at the neck is a case length problem, I think. Hope that answers your question. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Brass much thicker right by neck?
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