The RCBS Chamber/Case Length Gauge for .40 S&W (RCBS part no. 88272) is a simple, purpose-built tool that lets handloaders confirm a finished round will chamber correctly before it ever reaches the range or the field. Drop a resized and loaded case into the gauge and it immediately shows whether the case length and shoulder or case-mouth dimension fall within safe, correct limits. RCBS builds this gauge specifically for the .40 S&W cartridge, so pistol reloaders working up new batches of ammunition can catch an oversized or improperly trimmed case before it causes a chambering problem. It’s a small addition to the bench that saves a lot of guesswork.

Key Specifications

• Caliber-specific for .40 S&W, so it’s sized precisely to that cartridge’s chamber dimensions rather than a generic multi-caliber fit.
• Functions as a combination chamber and case length gauge, checking two critical dimensions with a single drop-in test.
• Backed by RCBS’s Limited Lifetime Warranty, reflecting the durability expected of a bench tool used on every loading session.
• Compact, lightweight design (about 0.13 lb) that stores easily in a range bag or reloading kit.

Frequently Asked Questions

What does this gauge actually check? It verifies that a loaded or resized .40 S&W case will both chamber properly and meets correct overall case length, catching problems before the round is fired.

Do I need this if I already check headspace on my press? A press die can resize a case correctly and still leave a length or seating issue that only shows up when the round is dropped into an actual chamber-dimension gauge like this one.

Buy the RCBS Chamber/Case Length Gauge .40 S&W

Add this RCBS gauge to your .40 S&W reloading bench to catch length and chambering issues before they become a range-day problem. See more from RCBS in our case prep supplies selection. Order it from our Lubbock, Texas gun shop for fast, reliable shipping.