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Rifles, Reloading, Optics, Equipment
Reloading
Determining Precision COALs
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<blockquote data-quote="Paladin300" data-source="post: 2197304" data-attributes="member: 115299"><p>Some have already suggested this I think? But here is my personal process. No fancy equipment needed. I deprime and form a couple of pieces of brass and then take the bullet I intend to use, place it in the brass with no primer, set it in the chamber and closer the bolt. I do it two or three times producing several dummy rounds that should be Identical. If they are you have you max coal to the lands for that bullet. I then pull the bullets on all but one which I keep as a reminder of my max coal on that bullet until I find its sweet spot and then I create a dummy round of that for future reference. Each bullet will have a different coal depending on the shape.</p><p></p><p>Once you have found your max coal. Check with the manufacturer to see where to begin seating bullets in relation to the lands. For example with Berger or Flatliners you will want to start 10 thou off the lands but with Nosler ABLRs and Hornady elds you will need to be 20 thou or greater off to start, they don't shoot well jammed into the lands because they weren't designed to.</p><p></p><p>Most likely you will find that you max coal is going to be what will fit in you Mag. Instead of chasing the lands a better approach maybe to see which bullet shoots the best with the highest BC and terminal performance. For ELR I single feed 256gr flatliners with a 4.1 coal into my 338 RUM @ 10 thou off the lands. 300gr Bergers have a 3.91 coal @ 10 thou of the lands. However, the wyatts box in the gun will only allow for a 3.81 coal, if memory serves correctly. For hunting purposes I get the best groups from 265gr ABLRs @ a 3.76 coal which is 25 thou of the lands. The noslers don't have the best BC but they shoot the tightest groups when loaded as they where designed to be loaded.</p><p></p><p>The bullet you choose and your mag oal will make a bigger difference in accuracy for LRH purposes than max coal.</p><p></p><p>I wasted a lot of pills chasing the lands with Barnes LRXs and Nosler ABLRs before I finally called and ask about where they were designed to be shot in relation to the lands. I throated my 338 to shoot the big heavies. It hates factory ammo. The only factory loaded ammo I can get to shoot in it and stay sub moa is premium swift A-frames. The heavies shoot 3/4 to 1/2 moa and work great for banging steal but won't allow me to use the wyatts box. The answer came when I finally found the sweet spot with the ABLRs. They allow me to take anything in North America to a grand, feed in the mag and shoot lights out. The pic below is a group shot with the ABLRs backed way off the lands and loaded for hunting purposes. If terminal performance proves to be as good as accuracy this will be my go to load for this rifle.</p><p></p><p>5 SHOTs 265 ABLR @ 2850 coal 3.76" 82gr IMR 4350 @ 28' F degrees. Group is .369 - .338 bullet diameter = .031</p><p></p><p></p><p>How close you are to the lands does not matter near as much as where in relation to those lands a particular projectile was intended to be loaded. Again, your mag length will most likely determine what you can use.</p><p>[ATTACH=full]274186[/ATTACH]</p></blockquote><p></p>
[QUOTE="Paladin300, post: 2197304, member: 115299"] Some have already suggested this I think? But here is my personal process. No fancy equipment needed. I deprime and form a couple of pieces of brass and then take the bullet I intend to use, place it in the brass with no primer, set it in the chamber and closer the bolt. I do it two or three times producing several dummy rounds that should be Identical. If they are you have you max coal to the lands for that bullet. I then pull the bullets on all but one which I keep as a reminder of my max coal on that bullet until I find its sweet spot and then I create a dummy round of that for future reference. Each bullet will have a different coal depending on the shape. Once you have found your max coal. Check with the manufacturer to see where to begin seating bullets in relation to the lands. For example with Berger or Flatliners you will want to start 10 thou off the lands but with Nosler ABLRs and Hornady elds you will need to be 20 thou or greater off to start, they don’t shoot well jammed into the lands because they weren’t designed to. Most likely you will find that you max coal is going to be what will fit in you Mag. Instead of chasing the lands a better approach maybe to see which bullet shoots the best with the highest BC and terminal performance. For ELR I single feed 256gr flatliners with a 4.1 coal into my 338 RUM @ 10 thou off the lands. 300gr Bergers have a 3.91 coal @ 10 thou of the lands. However, the wyatts box in the gun will only allow for a 3.81 coal, if memory serves correctly. For hunting purposes I get the best groups from 265gr ABLRs @ a 3.76 coal which is 25 thou of the lands. The noslers don’t have the best BC but they shoot the tightest groups when loaded as they where designed to be loaded. The bullet you choose and your mag oal will make a bigger difference in accuracy for LRH purposes than max coal. I wasted a lot of pills chasing the lands with Barnes LRXs and Nosler ABLRs before I finally called and ask about where they were designed to be shot in relation to the lands. I throated my 338 to shoot the big heavies. It hates factory ammo. The only factory loaded ammo I can get to shoot in it and stay sub moa is premium swift A-frames. The heavies shoot 3/4 to 1/2 moa and work great for banging steal but won’t allow me to use the wyatts box. The answer came when I finally found the sweet spot with the ABLRs. They allow me to take anything in North America to a grand, feed in the mag and shoot lights out. The pic below is a group shot with the ABLRs backed way off the lands and loaded for hunting purposes. If terminal performance proves to be as good as accuracy this will be my go to load for this rifle. 5 SHOTs 265 ABLR @ 2850 coal 3.76” 82gr IMR 4350 @ 28’ F degrees. Group is .369 - .338 bullet diameter = .031 How close you are to the lands does not matter near as much as where in relation to those lands a particular projectile was intended to be loaded. Again, your mag length will most likely determine what you can use. [ATTACH type="full" alt="A6566094-0BFA-45C6-BEE3-C122F8AC2398.jpeg"]274186[/ATTACH] [/QUOTE]
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