- Go/No-Go drop-in gauge for 300 Winchester Magnum — checks sized cases and loaded rounds
- Checks shoulder headspace to confirm the case shoulder is set to SAAMI specification
- Flags cases that have stretched beyond maximum case length and require trimming
- Identifies body diameter bulges near the web that could cause chambering failures
- Cylindrical precision steel construction machined to SAAMI tolerances for 300 Win Mag
- Simple drop-in check — case head flush or recessed indicates a correct fit
- Calibre-specific design; one gauge per cartridge for reliable, repeatable results
The Hornady Lock-N-Load Cartridge Gauge for 300 Winchester Magnum is a precision drop-in cylinder tool built to verify that sized cases and loaded rounds meet SAAMI chamber specifications. It checks three critical dimensions in one quick operation: shoulder headspace confirms the sizing die has pushed the case shoulder to SAAMI specification; maximum case length identifies brass that has stretched past its safe limit and needs trimming; and body diameter inspection detects bulges or expansion near the web area that would prevent the round from chambering cleanly. The 300 Win Mag is a popular choice for long-range red deer stalking and driven game in the UK, where reliable chambering under pressure matters as much as down-range performance. Drop the case into the gauge — a flush or recessed case head confirms correct sizing. Calibre-specific and machined to tight tolerances, it takes the guesswork out of case preparation at the bench.
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