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Rifles, Reloading, Optics, Equipment
Reloading
Seating Depth Informative Thread
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<blockquote data-quote="Jud96" data-source="post: 1820388" data-attributes="member: 69478"><p>The COAL in a loading manual is typically the SAAMI recommended length for that particular cartridge. That means if you load ammo to that overall length it will fit, feed, function, and be safe in all guns chambered in that caliber. You really don't want to go below their set length because you could run into premature pressure issues and other problems. Typically, you have room to seat the bullet out before you hit the rifling. You will normally find your best accuracy somewhere closer to the rifling than with what the manual recommends, in most cases. You can still find good accuracy at the book listed COAL with some bullets, but others, particularly long, heavy, VLD bullets like to be seating closer to the lands. If you want to start experimenting with seating depth, I recommend finding your lands with a Hornady OAL tool or by seating a bullet into a sized case extra long and slowly seat it deeper with your die until you stop feeling resistance when closing the bolt. If you use the later method, you have to remove your firing pin assembly and plunger ejector, if your bolt has that style ejector. This will allow the bolt to drop closed effortlessly when the chamber is empty. You want it to get to the point when chambering the dummy round where you can just start to feel it close easily. That will be where your rifling is, with that particular bullet. Every different bullet will touch the rifling at a different spot. So you have to do this every time you change bullet types, if you want to find your lands. This is the best method I have found and it sure beats any guessing or confusion.</p></blockquote><p></p>
[QUOTE="Jud96, post: 1820388, member: 69478"] The COAL in a loading manual is typically the SAAMI recommended length for that particular cartridge. That means if you load ammo to that overall length it will fit, feed, function, and be safe in all guns chambered in that caliber. You really don’t want to go below their set length because you could run into premature pressure issues and other problems. Typically, you have room to seat the bullet out before you hit the rifling. You will normally find your best accuracy somewhere closer to the rifling than with what the manual recommends, in most cases. You can still find good accuracy at the book listed COAL with some bullets, but others, particularly long, heavy, VLD bullets like to be seating closer to the lands. If you want to start experimenting with seating depth, I recommend finding your lands with a Hornady OAL tool or by seating a bullet into a sized case extra long and slowly seat it deeper with your die until you stop feeling resistance when closing the bolt. If you use the later method, you have to remove your firing pin assembly and plunger ejector, if your bolt has that style ejector. This will allow the bolt to drop closed effortlessly when the chamber is empty. You want it to get to the point when chambering the dummy round where you can just start to feel it close easily. That will be where your rifling is, with that particular bullet. Every different bullet will touch the rifling at a different spot. So you have to do this every time you change bullet types, if you want to find your lands. This is the best method I have found and it sure beats any guessing or confusion. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Seating Depth Informative Thread
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