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HORNADY A300M L-N-L MODIFIED CASE 300 WINCHESTER MAGNUM
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
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SKU: A300M-090255704730
Overview
Built for handloaders working with the .300 Winchester Magnum, this modified case is intended for use with Hornady Lock-N-Load O.A.L. gauges, including part numbers C1000 and C1550. It is manufactured to SAAMI specifications and is offered as a readily available fit for popular rifle chambers. This is a purpose-specific component for measuring overall length during cartridge setup, not a complete gauge package, and calipers are not included.
Why Hunters Choose the Hornady
Fits Popular
Rifle chambers in 300 Winchester
Manufactured Saami
Specifications
Use Hornady
O.A.L. gauges C1000 or C1550
Compatible Lock-n-load
Lock-N-Load Modified Case system
Straight Curved
Gauge options are identified in
Key Features
- Lock-N-Load modified case for 300 Winchester Magnum
- Designed for use with Hornady O.A.L. gauges C1000 or C1550
- Manufactured to SAAMI specifications
- Fits most popular rifle chambers
- Calipers are not included
Best Used For
- Handloaders checking cartridge overall length for 300 Winchester Magnum chambers
- Rifle reloaders using Hornady O.A.L. gauges C1000 or C1550
- Shooters needing a SAAMI-spec modified case for load development
- Hunters fine-tuning ammunition fit for a popular rifle chamber
Specifications
| Caliber | 300 Winchester Magnum |
|---|---|
| Calipers Included | No |
| Compatibility | O.A.L. gauges part numbers C1000 or C1550 |
| Gauge Part Number C1000 | Straight overall length gauge |
| Gauge Part Number C1550 | Curved |
| Manufactured To | SAAMI specs |
| Model | L-N-L Modified Case |
| Part Number | A300M |
Pros
- Fits popular rifle chambers in 300 Winchester Magnum
- Manufactured to SAAMI specifications
- Designed for use with Hornady O.A.L. gauges C1000 or C1550
- Compatible with Lock-N-Load Modified Case system
- Straight and curved gauge options are identified in the product information
Considerations & Trade-offs
- Designed for use with Hornady O.A.L. gauges C1000 or C1550, so it is not a standalone measuring tool.
- Calipers are not included, so you will need compatible measuring equipment to complete setup.
- This modified case is specific to .300 Winchester Magnum, so it is not a universal fit for other chambers.
- SAAMI-spec construction indicates standard chamber compatibility, but users still need to verify fit with their own rifle and gauge setup.
Suggested Comparisons
- O.A.L. gauge accessories
- Rifle chamber measurement tools
- Handloading setup tools
- Cartridge-specific modified cases
Suggested Accessories
- O.A.L. gauge
- Calipers
- Reloading bench tools
- Rifle chamber cleaning supplies
Frequently Asked Questions
What is the Hornady A300M L-N-L Modified Case used for?
It is a Lock-N-Load Modified Case for 300 Winchester Magnum, 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 product information 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 product fit other rifle chambers besides 300 Winchester Magnum?
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 Winchester Magnum.