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Anyone loading .223 or 5.56 for an AR knows there's no forcing a bolt closed on a round that's a hair out of spec. The RCBS Chamber/Case Length Gauge takes the guesswork out of it. Drop your finished cartridge into the precision-machined pocket and if it seats cleanly, you've confirmed it'll chamber in your rifle. It's a go/no-go style check that reads case length, diameter, and overall cartridge length all in one motion, which makes it a natural part of any bench routine.
The gauge is one piece and non-adjustable, machined to SAAMI maximum chamber dimensions so there's nothing to set up or recalibrate. The base has stepped reference surfaces that bracket minimum and maximum case head-to-datum position, and the mouth end does the same for case length. You rest the case head on a flat surface, slip the round in, and compare where it lands against those reference steps. Easy-to-read engravings mark the caliber so there's no mixing it up with the rest of your gauges.
This is the tool for folks running volume through a semi-auto, where reliable feeding matters more than squeezing out that last bit of accuracy. Spot-checking range brass or a fresh batch of sized cases before you commit to loading a few hundred rounds can save a frustrating day at the range. Since .223 Remington and 5.56x45mm NATO share the same external dimensions, this single gauge covers both.
One thing worth keeping in mind: a gauge checks against standard spec, and your individual chamber may be slightly tighter or looser. If you're running a snug match chamber, it's smart to also drop a few dummy rounds into your actual barrel before loading in bulk. Made in the USA and backed by RCBS, it's the kind of simple, durable tool that lives on the bench for years.
Yes. The 88280 is marked for both .223 Rem and 5.56x45mm NATO because the two share the same external case dimensions. Reloaders use the same dies and the same case gauge for both, even though the chambers themselves differ.
It's a go/no-go style tool. You drop your loaded round in with the case head resting on a flat surface, and the stepped reference surfaces at the base and mouth let you confirm the head-to-datum position and case length fall within spec. If the round sits correctly in the gauge, it should chamber in your rifle.
The gauge is cut to standard SAAMI maximum dimensions, so it's a reliable spec check for most firearms. That said, individual chambers vary, and a tight match or small-base situation can occasionally be fussier than the gauge. For a snug chamber, it's worth dropping a few dummy rounds into your actual barrel before loading in bulk.
No. It's a one-piece, non-adjustable tool with nothing to set up or recalibrate. You just drop rounds in and read against the engraved reference surfaces, which makes it quick and repeatable right out of the package.
| UPC | 604544630114 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 88280 |
| Length | 1.8000 |
| Shipping Weight | 0.29 |
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