What is the .45 Winchester Magnum?

The .45 Winchester Magnum is a factory cartridge in the Winchester Magnum family, introduced in 1977.

What cartridges are in the Winchester Magnum family?

The Winchester Magnum family includes the .45 Winchester Magnum and other related cartridges. Browse the full family on OpenCartridge.

.45 Winchester Magnum

Factory

Family	Winchester Magnum
Year	1977

SAAMI Pressure

MAP (PSI)	41,500
MAP (CUP)	40,000

Muzzle Velocity across 5 loads: Avg 1621 fps Min 1224 fps Max 1885 fps

Community Load Data

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250.00gr Hollow Point (HP) — 12.00gr

by imported_data · Aug 12, 2026

1224 fps

1.5750 OAL"

N/A Case

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185.00gr Hollow Point (HP) — 15.30gr

by imported_data · Aug 12, 2026

1678 fps

1.5750 OAL"

N/A Case

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250.00gr Hollow Point (HP) — 21.10gr

by imported_data · Aug 12, 2026

1576 fps

1.5750 OAL"

N/A Case

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230.00gr Full Metal Jacket (FMJ) — 23.90gr

by imported_data · Aug 12, 2026

1744 fps

1.5750 OAL"

N/A Case

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200.00gr Full Metal Jacket (FMJ) — 25.20gr

by imported_data · Aug 12, 2026

1885 fps

1.5750 OAL"

N/A Case

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PRO

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