The Forster Inside Neck Reamer is a precision reloading tool designed for .308 caliber cartridges with diameter specifications of .310-.3105 inches. This professional-grade reamer eliminates excess brass from case necks that can cause chamber pressure issues and accuracy problems.Forster Inside Neck Reamer for .308 bullet diameterPrecision diameter range: .310-.3105 inchesMounts in Case Trimmer for accurate operationCreates perfect symmetry by grinding entire bullet diameterConstructed from durable steel for long-lasting performanceDesigned for unsized and untrimmed fired casesEssential for serious reloaders seeking consistent ammunition performance this neck reamer prevents flyers caused by excessive case neck thickness and ensures proper chambering pressure for improved accuracy.