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Old 06-20-2004, 08:40 AM   #1
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Default Hornady SST Light Mags. out of a semi auto?

ok i bought a box of hornady SST LIght Magnum 30-06 shells for my remington 7400 and i shot about 6 shots or so and they shot terrible so i just tossed them in my truck and thats where they`ve been for awhile but the other day while i was waiting to go into work i read the back out of boredome and it says there not supposed to be shot out of a semi auto gun. now why is that? they cycled fine in the gun i just couldent get them to group worth a flip. thanks for any info
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Old 06-20-2004, 10:21 AM   #2
 
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Default RE: Hornady SST Light Mags. out of a semi auto?

The pressure curve is wrong for gas operated rifles. It doesn't matter in bolt guns, levers, or singles, but does in a self-loader.
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Old 06-20-2004, 01:06 PM   #3
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Default RE: Hornady SST Light Mags. out of a semi auto?

A gas operated semi auto has very specific things that need to happen inside the gun for it to operate properly. There is the gas port size and number of them, the location at which they are placed in the barrel, the spring sizes in the gun, and a page long list of other things.

You can't go changing things in a semi auto and still have them operate properly. As a bullet travels down the barrel faster than the "normal" loads it does not allow the pressure to build properly in order for the gas pistons to cycle properly.

All of the parts in a gas operated semi auto are manufactured to operate under specific pressures and bullet speeds. If you change anything you could make the gun inoperable. Simply changing the powder charge, or bullet weight in a cartridge can make the gun not work.
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Old 06-20-2004, 07:16 PM   #4
 
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Default RE: Hornady SST Light Mags. out of a semi auto?

Most semi-auto rifles shoot best with the midrange powders..you can damage or have the action fail to eject properly. I am pretty sure although I have some HE laying around the garage that there is a warning about it somewhere on the box..
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Old 06-20-2004, 09:10 PM   #5
 
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Default RE: Hornady SST Light Mags. out of a semi auto?

I've got a Browining BAR in 30-06 and the owners manual specifically warns not to use Hornady Light Mags; however, I had shot about a half a box before I read that worning. There was no warning on the ammo box about not shooting them in a simi-auto. Although the gun seemed to function fine with the HLM's, I haven't shot any more of them.

I do reload, basically stick with the midrage powders, and have not experienced any problems what so ever with the gun functioning properly.

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