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HORNADY A300A L-N-L MODIFIED CASE 300 BLACKOUT
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
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SKU: A300A-090255706154
Overview
Designed for use with Hornady O.A.L. gauges, this modified case is intended to help shooters work with chamber-specific overall length measurements for a popular rifle cartridge. It is manufactured to SAAMI specs and fits into the Lock-N-Load Modified Cases system for compatibility with part numbers C1000 or C1550. This is a specialized loading and setup accessory rather than a general-purpose case, so it is best suited to handloaders and rifle owners focused on cartridge fit and measurement. Calipers are not included.
Why Hunters Choose the Hornady
Fits 300
Blackout chamber for Lock-N-Load O.A.L
Manufactured Saami
Specifications
Compatible Hornady
Hornady O.A.L. gauges C1000 and
Readily Available
Popular rifle chambers
Simple, Purpose-built
Accessory for cartridge overall length
Key Features
- Lock-N-Load modified case for 300 Blackout chambers.
- Made to SAAMI specifications.
- Designed for use with O.A.L. gauge part numbers C1000 or C1550.
- C1000 is a straight overall length gauge.
- C1550 is a curved overall length gauge.
- Calipers are not included.
Best Used For
- Handloaders using O.A.L. gauges to measure cartridge overall length for 300 Blackout chambers
- Reloaders working with Hornady Lock-N-Load Modified Cases for chamber-specific measurement tasks
- Shooters needing a SAAMI-spec modified case for 300 Blackout setup and verification
- Users already equipped with Hornady C1000 or C1550 O.A.L. gauges and calipers
- Precision-minded rifle owners checking cartridge fit during load development and chamber measurement
Specifications
| Calipers Included | No |
|---|---|
| Cartridge | 300 Blackout |
| Case Type | Modified Case |
| Compatibility | Fits most popular rifle chambers |
| Gauge Part Number C1000 | Straight overall length gauge |
| Gauge Part Number C1550 | Curved |
| Manufactured To | SAAMI specs |
| Part Number | A300A |
| Recommended For Use With | O.A.L. gauges part numbers C1000 or C1550 |
Pros
- Fits the 300 Blackout chamber for Lock-N-Load O.A.L. gauge use.
- Manufactured to SAAMI specifications.
- Compatible with Hornady O.A.L. gauges C1000 and C1550.
- Readily available for use with popular rifle chambers.
- Simple, purpose-built accessory for cartridge overall length measurement.
Considerations & Trade-offs
- Designed specifically as a modified case for 300 Blackout, so it is not a general-purpose chambering tool for other cartridges.
- Requires a compatible Hornady O.A.L. gauge, specifically part number C1000 or C1550, to be used as intended.
- Calipers are not included, so those must be provided separately if needed for measurement work.
- The product is a component for cartridge overall length setup, not a complete measuring system on its own.
Suggested Comparisons
- O.A.L. gauges
- Rifle chamber case gauges
- Reloading measurement tools
- 300 Blackout reloading accessories
Suggested Accessories
- O.A.L. gauge
- Calipers
- Reloading tools
- Rifle chamber gauge
Frequently Asked Questions
What is the Hornady A300A L-N-L Modified Case used for?
It is a Lock-N-Load Modified Case for 300 Blackout, intended for use with Hornady O.A.L. gauges.
Which Hornady O.A.L. gauges is this modified case compatible with?
The product description says it is to be used with O.A.L. gauge part numbers C1000 or C1550.
Are calipers included with this modified case?
No. The description states that calipers are not included.
Is this modified case made to SAAMI specifications?
Yes. The product description says all Lock-N-Load Modified Cases are manufactured to SAAMI specs.
Does this modified case fit other rifle chambers besides 300 Blackout?
The description says Lock-N-Load Modified Cases are readily available to fit most popular rifle chambers, but this specific product is listed as 300 Blackout.