Submersion effect on ammo

mjcmichigan

Handloader
Dec 26, 2016
2,438
415
So long journey. The old news is May 2020 we were flooded by a pair of dams, one breached (basically catastrophic failure mid embankment(blow out)) and the downstream dam failed(overtopped and eroded away the embankment).
My reloading gear and ammo were all flooded and submerged for 3 days and covered in mud and silt. I salvaged what I could and today, I’d like thoughts on what I’ve observed.
I have some 45acp that survived the flood, and I noticed some unusually heavy recoil on some rounds.
I also have some Federal Fusion in 300 WSM I think 165’. I have extractor marks on those fired rounds and the Garmin says velocity ranges from 3183-3355. Huge range for factory ammo. I ran some handed 165 SGKHP (not flood ammo) loads after and got a normal 3057-3065fps.

The rounds with extractor marks(federal) primers looked a little flat to me and headstamps are clear.

Where previous I’d have said try the flood ammo, I’m now
Of the opinion to dispose of it.

Can anyone explain how submerged ammo could run higher pressure ?

I sent Federal Customer Service a note to get their thoughts…
 

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That is exactly what I’d hope to find.

Based on my experiences, and happily no damaged equipment…. I’ll be sorting all this ammo out.

Hate to toss so much brass, but it’s better than tossing a gun later…
 
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