Hornady Lock-N-Load 300 Rem Ultra Mag Modified Case

• Calibre-specific modified case for 300 Remington Ultra Magnum
• Designed for use with the Hornady Lock-N-Load O.A.L. Gauge system
• Drilled and tapped base accepts the gauge's bullet comparator insert
• Allows measurement of cartridge overall length to the rifling lands in your own chamber
• Manufactured to SAAMI specifications for the 300 Rem Ultra Mag
• Fits most popular 300 RUM rifle chambers without a live primer or charge

The Hornady Lock-N-Load Modified Case for 300 Remington Ultra Magnum is a purpose-made reloading tool designed for use with the Hornady Lock-N-Load O.A.L. Gauge. Machined to SAAMI specifications for the 300 Rem Ultra Mag chamber, the case is drilled and tapped at the base to accept the O.A.L. Gauge's bullet comparator insert. This allows handloaders to determine the precise cartridge overall length at which a given bullet contacts the lands in their specific rifle barrel — a key measurement for developing accurate, pressure-safe handloads. Because throat dimensions vary between individual rifles of the same calibre, measuring to the lands in your own chamber rather than relying on published data gives a more reliable seating-depth starting point. The modified case is chambered, not fired, so it fits the 300 RUM without requiring a live primer or powder charge. A straightforward, one-time purchase that pays dividends across every reloading session for this cartridge.

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