Description
Finding the right cartridge overall length is one of those steps that separates good handloads from great ones, and the Frankford Arsenal Cartridge Overall Length Gauge makes that measurement quick and repeatable. Instead of guessing where your bullet meets the lands, this little kit lets you measure it directly off your own rifle's chamber. All you need is a cleaning rod a quarter inch in diameter or smaller and a set of calipers, and you can have a solid number in a couple of minutes.
How the Cartridge Overall Length Gauge Works
The setup is refreshingly straightforward. You drop a cleaning rod into the chamber until it touches the bolt face and clamp the first collar at the muzzle. Then you chamber a round, bring the rod back down to touch the bullet tip, and clamp the second collar. Pull everything out, measure the inside distance between the two clamps with your calipers, and you've got the max length you can seat a bullet before it contacts the rifling. That measurement becomes your reference point for setting seating depth during your reloading sequence.
Why Handloaders Keep This OAL Gauge on the Bench
Seating depth has a real effect on pressure and accuracy, and getting your own chamber's dimensions beats relying on generic load book numbers. Because this gauge works off whatever rifle you're loading for, it handles any caliber you throw at it. Reloaders who've used it report good repeatability once you get a feel for the process, and the two-clamp design is about as simple as precision tools get.
What Comes in the Frankford Arsenal OAL Gauge Kit
The kit keeps things lean with two clamps and instructions, and it leans on gear most reloaders already own. You'll want a cleaning rod and calipers on hand since those aren't part of the package. The clamps are made of plastic, so a little care during use keeps them working well for the long haul. For the price of entry, it's a handy addition to any precision rifle reloading setup.
Key Specifications
- Manufacturer: Frankford Arsenal
- Manufacturer Part Number: 965887
- UPC: 661120658870
- Caliber/Gauge: Universal
- Type: Cartridge Overall Length (OAL) Gauge
- Ammunition Type: Rifle
- Cleaning Rod Compatibility: 1/4 inch diameter or smaller
- Measuring Method: Two-clamp system used with calipers
- Rifle Compatibility: Works on all rifles
- Country of Origin: United States
What’s Included
- Two cartridge overall length clamps
- Instructions
Frequently Asked Questions
What do I need to use the Cartridge Overall Length Gauge?
You'll need a cleaning rod that's a quarter inch in diameter or smaller and a set of calipers. Neither of those is included in the kit, so make sure you have them on the bench before you start. Most reloaders already own both.
Does this OAL gauge work with any caliber?
Yes. Because you take the measurement directly off your own rifle's chamber and bolt face, it works on all rifles regardless of caliber. That's what makes it a universal tool rather than one built for a single cartridge.
How does the Frankford Arsenal gauge measure seating depth?
You clamp one collar at the muzzle with a rod touching the bolt face, then chamber a round and clamp the second collar once the rod touches the bullet tip. Measuring the inside distance between the clamps gives you the maximum overall length before the bullet contacts the lands. From there you can set your seating depth accordingly.
What is the Cartridge Overall Length Gauge made of?
The clamps are made of plastic, so a gentle hand during setup keeps them in good shape. Reloaders report solid repeatability when the tool is handled with a little care. Treated well, it holds up over plenty of use.





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