RCBS Full Length Taper Crimp Set Features The RCBS Small Base/Taper Crimp set is built around a Small Base full length sizing die hardened steel construction that resizes the case body more aggressively than a standard full length die to guarantee reliable chambering in AR-style and other semi-auto actions. This matters for .22 ARC shooters running gas guns where a case that is not sized enough can cause chambering issues under recoil spring pressure. The second die in the set is a Taper Crimp seating die which applies a gentler more forgiving crimp across cases of slightly varying length than a traditional roll crimp would. That forgiveness practically eliminates case neck crimp bulges and buckled shoulders when loading cannelured bullets. Together these two dies make the reloading process smoother for progressive press users loading .22 ARC in volume for AR-platform rifles. The Small Base sizing die resizes cases down to true SAAMI dimensions important for handloaders feeding ammunition through a gas-operated action rather than a bolt gun. A compatible shell holder or shell plate numbered 32 is required and sold separately. The RCBS Small Base/Taper Crimp die set gives AR-15 reloaders a dedicated .22 ARC solution for sale at GrabAGun. RCBS Full Length Taper Crimp Set Specifications Manufacturer: RCBS Model: Full Length Taper Crimp Set Caliber: .22 ARC Case Material: Hardened Steel Gun Type: Rifle Dies in Set: 2 Reloading Die Type: Small Base/Taper Crimp Available At: GrabAGun