🔎 UNIDENTIFIED Modern or a bit older?

[Nathan W]

Found this bullet . The actual bullet is deteriorating which I've never seen. Says HP, hollow point? Found in vacinity as pistol ball . Could it be modern and the soil be highly mineralized to speed up the deterioration?

 

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[RickDDE]

Found this bullet . The actual bullet is deteriorating which I've never seen. Says HP, hollow point? Found in vacinity as pistol ball . Could it be modern and the soil be highly mineralized to speed up the deterioration?

HP stamp is used by Hirtenberger Patronen
Zündhütchen-und Metallwarenfabrik A.-G., Hirtenberg, Niederdonau, Austria.

Since it's a rimfire, I would lean towards pretty old. I found a .22 with US stamp that was from 1890s.

Headstamp Codes – International Ammunition Association

cartridgecollectors.org

 

[RickDDE]

Headstamp Codes – International Ammunition Association

cartridgecollectors.org

HP stamp is used by Hirtenberger Patronen
Zündhütchen-und Metallwarenfabrik A.-G., Hirtenberg, Niederdonau, Austria.

Since it's a rimfire, I would lean towards pretty old. I found a .22 with US stamp that was from 1890s.

Headstamp Codes – International Ammunition Association

cartridgecollectors.org

This would be worth digging into. I found this online, but yet to be verified.

• Otto Eberhardt Patronenfabrik (English: "Otto Eberhardt Cartridge Factory") was a munitions company established in 1860. The company's Hirtenberger Patronen, Zündhütchen und Metallwarenfabrik (English: "cartridge, primer and metalware fabrication in Hirtenberg") near Wiener Neustadt (proofmark "am") used forced labor during World War II from a sub-camp of the Mauthausen-Gusen concentration camp and produced ammunition including 9×19mm Parabellum (pistol and submachine gun) and 8 mm Mauser (rifle) cartridges. The company also had a factory in Ronsdorf near Wuppertal (proofmark "ap") which produced rifles. Additional Gustloff facilities were in Meiningen and Weimar. (en)

 

[Nathan W]

Headstamp Codes – International Ammunition Association

cartridgecollectors.org

This would be worth digging into. I found this online, but yet to be verified.

• Otto Eberhardt Patronenfabrik (English: "Otto Eberhardt Cartridge Factory") was a munitions company established in 1860. The company's Hirtenberger Patronen, Zündhütchen und Metallwarenfabrik (English: "cartridge, primer and metalware fabrication in Hirtenberg") near Wiener Neustadt (proofmark "am") used forced labor during World War II from a sub-camp of the Mauthausen-Gusen concentration camp and produced ammunition including 9×19mm Parabellum (pistol and submachine gun) and 8 mm Mauser (rifle) cartridges. The company also had a factory in Ronsdorf near Wuppertal (proofmark "ap") which produced rifles. Additional Gustloff facilities were in Meiningen and Weimar. (en)

Ok thanks for the In depth response

 

[Rmeav8r]

Looks modern, 1980's. Look closely under the HP for a single number. This would indicate the year. These HP stamped 22 LR cartridges were made up until the late 1980's. You can post those pictures on the International Ammunition Association Inc. webpage and someone there will 100% verify the age or date range.