If it stays dry and relatively stable in temperature, forever.
In contrast, I bought an old Mauser from Mitchells, and went to a gun show shortly after and bought a 250 round battle pack of 8mm mauser that had been manufactured back in 1954. How did it work?
Just fine, went bang every time I pulled the trigger. Not that accurate, but it worked nonetheless.
Strange coincidence you should ask that question --- as I asked myself that very thing last weekend. Just bought a Sig Mosquito and had about 500 rounds of Federal 22LR in storage that has to be at least 20 yrs old. It was crappy lookin' stuff, but I thought I might as well give it a try. Had 19 FTFs out of the 500. So there you go ... real test results.
BTW --- I later picked up some CCI mini-mags. The pistol performed flawlessly on 300 rounds. A lot of fun to shoot.
I have some Winchester ammo that was made for the Army's small bore rifle team 1956 and it still shoots just as accurate as new.
ED
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