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Hornady Lock-N-Load Modified B Case 7mm PRC Rifle Brass
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
$10.99
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SKU: B7MMP-090255721331
Overview
Built for handloaders who want to measure cartridge overall length with the bullet they actually plan to use, this modified case is made to work with the Lock-N-Load O.A.L. Gauge. It is sized for 7mm PRC chambers and manufactured to SAAMI specifications, with a threaded case head and an oversized neck to accept the intended bullet. That makes it a practical setup tool for careful load development where small dimensional differences matter. It is a specialized accessory rather than a general-purpose brass case, so it fits best in a precision reloading bench.
Why Hunters Choose the Hornady
Use Lock-n-load
O.A.L. Gauge system
Lets You
The intended bullet
Overall Length
Accuracy specified to 0.001 inches
Manufactured Saami
Specifications for 7mm PRC chambers
Threaded Case
Head supports secure gauge attachment
Key Features
- Fits 7mm PRC chambers.
- Designed for use with the Lock-N-Load O.A.L. Gauge.
- Allows the intended bullet to determine overall length.
- Overall length accuracy to 0.001 inches.
- Manufactured to SAAMI specifications.
- Threaded at the case head with a 0.002-inch oversized neck.
Best Used For
- Handloaders setting precise overall length with a Lock-N-Load O.A.L. Gauge
- Shooters working up 7mm PRC loads with the intended bullet profile
- Reloaders who want a modified case built to SAAMI specifications
- Precision-minded hunters verifying cartridge dimensions before final load development
Specifications
| Accepts Intended Bullet | true |
|---|---|
| Fits | 7mm PRC Chamber |
| Item Number | B7MMP |
| Manufactured To Saami Specifications | true |
| Overall Length Accuracy | 0.001" |
| Oversized Neck | 0.002" |
| Specifications And Features | It |
| Threaded At The Case Head | true |
Pros
- Designed for use with the Lock-N-Load O.A.L. Gauge system
- Lets you measure overall length with the intended bullet
- Overall length accuracy specified to 0.001 inches
- Manufactured to SAAMI specifications for 7mm PRC chambers
- Threaded case head supports secure gauge attachment
- 0.002-inch oversized neck accepts the intended bullet
Considerations & Trade-offs
- Requires a Lock-N-Load O.A.L. Gauge to serve its intended purpose; it is not a standalone measuring tool.
- Designed specifically for 7mm PRC chambers, so it is only relevant if you load for that cartridge.
- The oversized neck is part of the design for accepting the intended bullet, which means it is a specialized setup component rather than a universal case.
- Its value is tied to precision measurement work, so it may be unnecessary for reloaders who do not need 0.001-inch overall length adjustment.
Suggested Comparisons
- Reloading dies and case gauges
- Overall length gauges
- Precision reloading tools
- 7mm PRC reloading accessories
Suggested Accessories
- Modified case for 7mm PRC chamber
- O.A.L. gauge
- Case neck brush
- Reloading calipers
Frequently Asked Questions
What is this Hornady Modified B Case used for?
It is a modified case for the Hornady Lock-N-Load O.A.L. Gauge, used to determine overall length with the bullet you intend to load.
What chamber does this case fit?
It fits 7mm PRC chambers.
How precise is the overall length measurement with this modified case?
The product states it allows overall length to be determined to within 0.001 inches.
Is this case made to SAAMI specifications?
Yes. The product description says it is manufactured to SAAMI specifications.
Does it accept the bullet I plan to load?
Yes. The oversized neck is described as accepting the intended bullet.