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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Need an education- Chamber and throat
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<blockquote data-quote="woods" data-source="post: 339706" data-attributes="member: 6042"><p>I didn't see this touch on so thought I would bring it up.</p><p></p><p>IMO, the longer throats are also a safety margin for the gun manufacturers in that when you have a longer throat you have a larger combustion chamber. With a factory load the longer throat will develop less pressure (and less velocity) than one with a shorter throat.</p><p></p><p>For instance I have a 338RUM with a custom rebarrel that I sent a dummy load to the gunsmith and said to throat it so that this bullet will just touch the lands. Now I can seat a little shorter than that, be close to the lands and still fit the magazine. This means that it has a much shorter throat than a factory gun. This gun will expand primer pockets at max loads in manuals. For example the max load with 225 gr bullets is 98 gr RL25 but I can only shoot 94 gr RL25 and have the case hold a primer. Still get the book velocity at 94 gr so that is not any big deal.</p><p></p><p>Tight chambers and short throats develop more pressure (all other things being equal) than loose chambers and long throats. So the gun manufacturers use the longer throats as a safety margin.</p></blockquote><p></p>
[QUOTE="woods, post: 339706, member: 6042"] I didn't see this touch on so thought I would bring it up. IMO, the longer throats are also a safety margin for the gun manufacturers in that when you have a longer throat you have a larger combustion chamber. With a factory load the longer throat will develop less pressure (and less velocity) than one with a shorter throat. For instance I have a 338RUM with a custom rebarrel that I sent a dummy load to the gunsmith and said to throat it so that this bullet will just touch the lands. Now I can seat a little shorter than that, be close to the lands and still fit the magazine. This means that it has a much shorter throat than a factory gun. This gun will expand primer pockets at max loads in manuals. For example the max load with 225 gr bullets is 98 gr RL25 but I can only shoot 94 gr RL25 and have the case hold a primer. Still get the book velocity at 94 gr so that is not any big deal. Tight chambers and short throats develop more pressure (all other things being equal) than loose chambers and long throats. So the gun manufacturers use the longer throats as a safety margin. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Need an education- Chamber and throat
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