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-   -   7.62x54r ammo sounds half full? (http://www.firearmstalk.com/forums/f30/7-62x54r-ammo-sounds-half-full-74914/)

GaryGlock 10-23-2012 08:55 PM

7.62x54r ammo sounds half full?
 
I just got some brownbear shipped to me and heard the powder in the rounds shaking around, so I started to shake them and they all sound and feel half full, is this normal?

elfmdl 10-23-2012 09:03 PM

Yes powder will likely never fill up the entire case, so you would be able to hear it. Otherwise it would cause excessive pressure and be dangerous

GaryGlock 10-23-2012 09:10 PM

Arite, Ive never heard a round shake like that! Got me nervous.. it won't effect performance then? I was thinkin the round was gonna roll oit of the barrel at my feet.

c3shooter 10-23-2012 11:56 PM

Not unless your feet at 2000 meters away. Smokeless rifle cartridges are not filled with powder. Room to shake.

GaryGlock 10-23-2012 11:58 PM

Haha, Arite thanks guys.

OldManMontgomery 10-24-2012 12:56 AM

Not uncommon phenomenon. It depends on the powder used, actually. In most any cartridge, one can find a very slow powder that will work very well if packed in and the bullet beat into position. A 'fast' powder for the same cartridge will require less volume (or weight, depending on how one measures) and leave extra space.

I tend to use slower powders and load them full. I think it gives me a more uniform burn rate, from round to round.

Hatcher's Notebook mentions this. Some early loads for the 03 Springfield would give different velocities if the rifle were held muzzle up vs. being pointed at the ground prior to firing. Seems to be the position of the powder in the case affects the burn results.

JonM 10-24-2012 12:58 AM

depends on the powder used. ideally you want the case full enough for a slightly compressed load. most rifle cartridges do better with powders that completely fill the case.

the reason you get some shake with surplus and el-cheapo type ammo is they use super cheap ball powder that tends to burn faster with minimal charges to save costs.

one of the dangers of minimal charges is detonation. this happens when there is too much air space in the case and instead of going down the barrel the powder charge builds up too much pressure to fast and it overloads the case causing a kaboom. however that wont happen in factory ammo or with small cases like 308 30-06 or 7.62x54r. its a danger in big belted magnum cartridges like 458 winmag 458 lott 50bmg 338 lapua etc


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