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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Tight neck chamber
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<blockquote data-quote="Ackley Man" data-source="post: 270424" data-attributes="member: 16583"><p>I was in a rush when I posted the last reply and wanted to offer a couple other suggestions. </p><p> </p><p>The purpose of a tight necked chamber is to keep the bullet in precise alignment with the bore. This can positively impact accurcy provided that bullet run-out is kept to an absolute minimum.</p><p> </p><p>As previously stated, a tight necked chamber is not acceptable for standard hunting conditions. A couple of grains of sand can keep the round from chambering or cause a stuck case. Wose yet it could cause a live round to become stuck. If that should happen you would have a real mess on your hands. For hunting, a good alternative would be a minimum SAMI chamber neck. You don't have to turn necks and have the advantage of minimum clearance.</p><p> </p><p>Another alternative for a tight necked chamber if you don't want to turn case necks is to buy a large supply of brass and cull it by using a neck mic for case neck thickness. Then make up a dummy round with one of the culls. With the dummy round in hand a gunsmith can order a special dimension reamer and cut the chamber neck so the loaded culls will maintain the 1 1/2 to 2 thousands clearance (per side). You then can have the benefits of a tight neck chamber without the labor pains of neck turning. The gunsmith may zing you for the price of the reamer but you would own it and could have it used in the future for other barrels.</p></blockquote><p></p>
[QUOTE="Ackley Man, post: 270424, member: 16583"] I was in a rush when I posted the last reply and wanted to offer a couple other suggestions. The purpose of a tight necked chamber is to keep the bullet in precise alignment with the bore. This can positively impact accurcy provided that bullet run-out is kept to an absolute minimum. As previously stated, a tight necked chamber is not acceptable for standard hunting conditions. A couple of grains of sand can keep the round from chambering or cause a stuck case. Wose yet it could cause a live round to become stuck. If that should happen you would have a real mess on your hands. For hunting, a good alternative would be a minimum SAMI chamber neck. You don't have to turn necks and have the advantage of minimum clearance. Another alternative for a tight necked chamber if you don't want to turn case necks is to buy a large supply of brass and cull it by using a neck mic for case neck thickness. Then make up a dummy round with one of the culls. With the dummy round in hand a gunsmith can order a special dimension reamer and cut the chamber neck so the loaded culls will maintain the 1 1/2 to 2 thousands clearance (per side). You then can have the benefits of a tight neck chamber without the labor pains of neck turning. The gunsmith may zing you for the price of the reamer but you would own it and could have it used in the future for other barrels. [/QUOTE]
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Tight neck chamber
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