I'm guessing ammo issue too.
I sold the Colt .25 acp automatic package (gun, box, papers, & "original" ammo) several years ago to a Colt collector and he was thrilled to get the box of "original" ammo which was Geco, less exactly 9 rounds which he figured were the only rounds ever through the gun.
Anyway, the Geco box was stated as manufactured in Karlsruhe, Germany, and dated 1973, as the gun itself serial numbered 1973. Note that this was still FRG (West Germany) in those days.
The red colored stuff on the rounds is actually shellac over the boxer primers, or so that Colt expert told me. I have no experience firing any Geco ammo, but I also haven't seen any for sale in LGS, Wallyworld or anywhere around here so I wonder if maybe the OP's ammo is (was) very old, maybe not up to Sammi specs???
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Charlie B
SWCA#3083, SWHF#570
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