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The .338 ARC is a newer big-bore round from Hornady built to run in a standard AR-15, and loading for it means your brass needs to stay within spec to feed and chamber reliably. That is exactly where this cartridge gauge earns its spot on the bench. Drop a sized case or a finished round in, check that the head sits flush with the back of the gauge, and you know in a second whether it will fit a correctly cut chamber.
This is a go/no-go style gauge cut to SAAMI maximum tolerances. It confirms that your case length, shoulder position, and overall dimensions fall inside spec so you are not chambering rounds that are oversized, swollen, or pushed out of shape from resizing. For a cartridge like the .338 ARC that shares the 0.441 inch case head with the 6mm ARC and 6.5 Grendel family, keeping brass dialed in is what keeps a semi-auto running clean round after round.
The body is machined from stainless steel, so it shrugs off the handling, oils, and grit that come with regular bench use and resists corrosion over time. Reloaders who run these gauges tend to come back for more calibers once they see how fast they speed up a quality-control pass, and the laser engraving on the body makes it easy to grab the right one when you have several in the drawer.
There is no learning curve here. If you are developing loads, batch-checking resized brass, or just doing a final verification before a round ever touches your chamber, this gauge gives you a fast, repeatable answer. It is a small piece of gear that saves you from a stiff bolt, a failure to feed, or worse down the line.
You simply insert a sized case or a loaded round into the gauge and check whether the case head sits flush with the back. If it drops in and sits flush, your brass falls within SAAMI tolerances and should chamber in a correctly cut barrel. It is a quick plunk-style check that takes just a second per case.
No. This is a go/no-go case gauge that verifies case dimensions like length and shoulder position against SAAMI max tolerances. If you want to dial in precise bullet seating depth and jump to the rifling, that is a job for Hornady's separate Lock-N-Load O.A.L. Gauge, which uses a modified case.
Yes, this particular gauge is machined from stainless steel, which helps it resist corrosion and wear from regular handling at the bench. The caliber is laser engraved on the body so it is easy to identify when you keep several on hand.
It is aimed at handloaders and armorers working with the .338 ARC who want a fast way to quality-check cases and finished rounds. Whether you are developing loads or batch-checking resized brass, it gives you a repeatable answer before a round ever reaches your chamber.
| UPC | 090255807288 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 380728 |
| Caliber/Gauge | .338 ARC |
| Capacity | 2 |
| Shipping Weight | 0.234 |
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