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IMPERIAL SPORTING .50" UPWARDS /
550 MAGNUM
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IMPERIAL SPORTING .50" UPWARDS
550 MAGNUM
550 · 2 headstamps · 2 scans
| Calibre | 550 |
| In the cabinet | IMPERIAL SPORTING .50" UPWARDS · 4 images |
Reading the headstamp
12 o'clockMaker's name or factory code
6 o'clockCalibre or year of manufacture
CentrePrimer — Berdan or Boxer, and any seal colour
Research notes
The .550 Magnum was developed by Neal Shirley from Yuma, AZ and is based on a 460 Weatherby case necked up to .550”. There was a write-up of the 550 Magnum in the March/April 2020 edition of African Outfitter Magazine.
Provenance
2014Catalogued in the collection
2026Record last revised · 2026-01-10
Same drawer
