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hornady loads.. |
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bobaldoo
Optics Apprentice Joined: June/06/2011 Location: alberta canada Status: Offline Points: 72 |
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Posted: June/02/2012 at 23:02 |
in hornadys 8th edition it states that when making loads for a 300 win mag the reloader should stick to near max load do to a thing called S.E.E (secondary explosive effect)...does this mean you should stay away from the lower loads that are posted in their book or anything lower than what is on the page...to a new reloader this is confusing especially when you've been told to start 5 to 10% lower that the lowest load a work your way up checking the pressure as you go.....was also told useing a faster powder can remedy this but kinda unsure about either at this point......
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billyburl2
Optics Master Extraordinaire Joined: January/08/2009 Location: Cottonwood, AZ Status: Offline Points: 4015 |
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For the most part, the loads listed are safe. I would not go below the minimum charge listed, for the reasons listed. Buy a couple of other books and cross-reference, use information from your powder manufacture. There is also a lot of information available online.
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If it is tourist season, why can't we shoot them?
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helo18
Optics Jedi Knight Joined: December/02/2006 Location: Montana Status: Offline Points: 5620 |
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I wouldnt go below the lowest listed powder charge. I usually start below the max a couple grains and work up till i see pressure signs. Are you trying to find a reduced recoil load?
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pyro6999
Optics Retard OT TITAN Joined: December/22/2006 Location: North Dakota Status: Offline Points: 22034 |
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im guessing they are referring to a "hang fire" which in a magnum from what ive read over the years is very unpleasant to experience.
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They call me "Boots"
375H&H Mag: Yeah, it kills stuff "extra dead" 343 we will never forget God Bless Chris Ledoux "good ride cowboy" |
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dsr
Optics Apprentice Joined: May/31/2007 Location: United States Status: Offline Points: 244 |
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No SEE is not a hang fire.
The story is a large magnum case with a slow burning powder where the
charge only takes up part of the case volume.
The theory is when the primer is ignited the powder which is laying on
the side of the case is ignited in the middle of the case sending a pressure
wave forward to the base of bullet and backward to the case head. The waves fronts are both within allowable
limits but after reflecting back from the ends the wave fronts are additive when
they meet in the center of the case and the resulting pressure then causes the
weapon to explode. It is important to
note that NO Ballistics Laboratory(like Sierra, Hornady, Winchester, Remington,
etc) has ever duplicated an SEE!
They say that because they have
received many reports from reloaders of
reduced loads causing problems over the years.
The loads listed loads in the manual are safe to shoot just do not go
below them. |
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Bigdaddy0381
MODERATOR Georgia peach Joined: February/27/2007 Location: Georgia Status: Offline Points: 13682 |
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If the bullets didn't move I could "maybe" see this happening. When the bullets moves there is nothing "solid" to send the waves back. something always brakes at it weakest point. the bullet would be the weakest point. I'm not saying SEE is true or not. I just know I have a few loads with 80% case volume and have never had any trouble and those are max or better loads with lighter bullets and semi faster powders in a 300win mag.
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dsr
Optics Apprentice Joined: May/31/2007 Location: United States Status: Offline Points: 244 |
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The burning powder waves are MUCH faster than the bullet is traveling at that point. Even at the muzzle where the bullet is traveling between 2700~3100 ft/s the gas is traveling better than 5000 ft/s
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SVT_Tactical
MODERATOR Chief Sackscratch Joined: December/17/2009 Location: NorthCackalacky Status: Offline Points: 31233 |
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wonder why subsonic loads don't ever experience this?
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Bigdaddy0381
MODERATOR Georgia peach Joined: February/27/2007 Location: Georgia Status: Offline Points: 13682 |
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Beats me then. Use a filler
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P&Z Firearms , Pro gun cleanings and gun repair and wood refinishing.
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Steelbenz
Optics Jedi Knight ROLL TIDE ROLL Joined: January/03/2006 Location: Heart of Dixie Status: Offline Points: 5153 |
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What Hornady is tell you is it's best to find and use the closest charge weight accuracy node to the listed max charge. The closer you are to 100% fill in the case the less likely hood of a problem. And to address the faster powder issue... No, it would actually increase the chance due to the fact you would use less volume of powder not more in a faster burning powder.
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bobaldoo
Optics Apprentice Joined: June/06/2011 Location: alberta canada Status: Offline Points: 72 |
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not really looking for a reduced load but more so the best load for my gun.. more than likely all of hornady loads listed are safe, but with S.E.E sometimes being an issue it is just smarter to stick with higher load density..from what i'v read they try to dublicate this in the lab and when every 500 gun would explode they stll had no idea what they did to cause it........thanks for all your input, much appreciated...
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"I can hear you, the rest of the world hears you and the people who knocked these building down will hear all of us soon." g bush....
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dsr
Optics Apprentice Joined: May/31/2007 Location: United States Status: Offline Points: 244 |
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Just to say again it has never occurred in a lab setting.
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Stevey Ducks
Optics Apprentice Joined: December/03/2011 Status: Offline Points: 266 |
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I have never seen any explosive or pressure spikes from using lower than normal or suggested loads of slow burning powders in large capacity cases but I have read much about it -- "splintered stocks", "blown away floor plates" and the like and apparently this is the SEE or secondary explosive effect.
Using greatly reduced amounts of slow burning powder such as 50 grains vs 75 grains of the same powder in a .300 Win mag is certain to give less than good results, enough so I would not want to try it. I have read about this type of thing for years but have been not ready to test it out or have seen any valid documentation. I try to fill the case up to 85% capacity plus of a suitable powder. If 85% plus capacity is excessive I load for a .308 Win and get about 90 % of the velocity with near 100% capacity.
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Alan Robertson
Optics Master Joined: October/31/2009 Location: Oklahoma Status: Offline Points: 1763 |
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It's almost universally recommended to NOT reduce slow- burn rate powder charges much below max, especially in the .300 Winnie.
In similar vein, Trail Boss can turn a thumper into a tapper for that all- important rifle familiarization and practice which one might not do, otherwise. Tame that Firebird! |
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