Brownells .38 Caliber/.357 Cal 5 deg Barrel Chamfering Plug Gauge

The throat diameter range for achieving maximum accuracy is extremely narrow, at 0.004 inches. Deviating from this range, either smaller or larger, will result in reduced accuracy. By inserting the plug gauge into the barrel throat, users can quickly determine when they are nearing the correct diameter. This tool provides a warning before exceeding the optimal range. Additionally, it serves as a valuable diagnostic tool for firearms with reported accuracy issues. It is specifically designed for