Hornady Lock-N-Load A Series Modified Case - 300 Win Mag (A300M)
$6.16
$6.75
(You save
$0.59
)
- Caliber-Gauge:
- 300 Winchester Magnum
- Finish-Color:
- Brass
- Compatible With:
- Lock-N-Load Gauges
The Hornady Lock-N-Load A Series Modified Case for 300 Win Mag (A300M) is a precision reloading accessory engineered for shooters who demand consistency in their handloads. This modified case works specifically with Hornady's Lock-N-Load Precision gauges, giving you the ability to verify cartridge specs with repeatable accuracy shot after shot. Whether you're developing loads for a long-range hunting rifle or fine-tuning ammunition for competition, a properly gauged case ensures your chamber alignments are dead-on and your measurements are trustworthy.
What makes this case different from standard brass is its engineering for gauge work. A precision fine thread attachment keeps the case perfectly square when seated in your Lock-N-Load gauge, eliminating the guesswork from alignment. The case neck is also specially prepared—opened slightly and rounded to spec—so standard-diameter bullets seat concentrically without binding or cocking. That concentricity matters: it's the difference between ammunition that shoots where you aimed and ammunition that shoots where it feels like it.
This is a dedicated gauge case, not ammunition for firing. Keep it with your reloading tools and reference it whenever you need to verify overall length, headspace, or neck dimensions on your handloads. It's the kind of small-detail investment that separates careful reloaders from careless ones.
Key Features
- Engineered specifically for Hornady Lock-N-Load Precision gauges
- Fine-thread attachment maintains perfect case alignment for accurate measurements
- Neck specially rounded and opened for concentric bullet seating verification
- Ideal for 300 Win Mag handload development and quality control
- Helps ensure consistent overall length and headspace in your ammunition
Specifications
| Product | Lock-N-Load A Series Modified Case |
| Caliber | 300 Win Mag |
| Model Number | A300M |
| Manufacturer | Hornady |
| Category | Reloading Accessory |
| Included | Modified case only (Dial Caliper and OAL Gauge sold separately) |
Frequently Asked Questions
What do I use this modified case for?
This is a reference gauge case for verifying your handloads against Hornady's Lock-N-Load Precision gauges. Use it to check overall length, headspace, neck concentricity, and other critical dimensions on the ammunition you're developing. It's not meant to be fired.
Will this work with other gauge systems?
This case is designed specifically for Hornady's Lock-N-Load Precision gauges. The fine-thread attachment and case preparation are engineered for that system.
Do I get calipers and an OAL gauge with this?
No. The modified case comes alone. The dial caliper and OAL gauge are sold separately and are necessary to use this case as a reference standard.
Is this case safe to fire?
This is a modified case designed for gauging, not for firing. Use it only as a reference tool with your Lock-N-Load gauges to verify handload specifications.
