This video features Brownells Gun Tech Steve Ostrem explaining the necessity of case trimming during reloading. He clarifies that while rifle cases often require trimming due to higher pressures and neck stretching, handgun cases generally do not. Specific exceptions are noted for roll-crimped handgun cartridges like .357 Magnum and .44 Magnum, and lever-action rifle cartridges like .30-30 Winchester, where precise case length is crucial for proper crimping and feeding. Taper-crimped rounds like 9mm Luger and .45 ACP, as well as medium-pressure rounds like .38 Special, usually only need the case mouth flare addressed.
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