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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/02/2012 at 23:02
bobaldoo View Drop Down
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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......
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/03/2012 at 00:33
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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.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/03/2012 at 07:30
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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?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/03/2012 at 09:24
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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.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/04/2012 at 09:44
dsr View Drop Down
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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.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/04/2012 at 11:06
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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.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/04/2012 at 11:12
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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
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/04/2012 at 11:15
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wonder why subsonic loads don't ever experience this? 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/04/2012 at 11:52
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Beats me then. Use a filler

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/04/2012 at 12:18
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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.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/04/2012 at 14:36
bobaldoo View Drop Down
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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...
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/04/2012 at 15:49
dsr View Drop Down
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Just to say again it has never occurred in a lab setting.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/21/2012 at 23:22
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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. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/23/2012 at 20:27
Alan Robertson View Drop Down
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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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