RCBS Base Forming Die 300 Weaver

Product #: 919917 RCBS #: 57010-300Weav Base Form-G
Date expected in stock if ordered today: 02/12/2016
Please Sign In or Create an Account to use this feature.
  • Information
Case forming dies are for the reloader interested in forming cases from one caliber to another. This is done either because the case needed is prohibitively expensive or it is otherwise unavailable. The specific steps necessary to form cases will vary greatly depending on what changes must be made to the parent case and may include initial forming, separate base forming, annealing the brass, making the neck larger or smaller, cutting the cartridge rim and fireforming the case in the firearm's chamber to obtain the finished caliber.

Case forming dies are designed to reduce the case by steps to eliminate case stress or collapse and to prolong case life. There will be one or more form dies for each caliber. After forming and trimming, cases must then be full length sized, using the full length sizer in the reloading die set for the finished caliber. RCBS does not recommend using full length sizer dies for the actual case forming process. Case forming dies (threaded standard 7/8 x 14 unless otherwise noted) will withstand the normal case forming pressures encountered but are not intended to swage the base of the case. When that is required, a special Base Form die is needed. Base Form dies are unthreaded and require the use of a 3-ton arbor press.

Technical Information

  • Some cases will need to be shortened after initial forming. A Trim Die is designed so that a mill type file can be used to trim the case to the correct overall length without damaging the surface of the die.
  • Frequently, changes to a case will result in brass that is too thick at the case's neck. A Neck Reamer, if needed, may be chucked in a tap wrench or in a hand drill. A drill press is not recommended.
  • Was this information helpful? Yes No

    Thank you! Your valuable feedback helps improve our product information and offering.

    Help Us Improve

    Please enter the missing required fields:

      Do you accept our terms and conditions? *
      Know someone who may like this? Email this Page to a Friend

      Customer Reviews

      The statements and opinions expressed within Customer Reviews reflect each author's personal perspective and do not imply endorsement by MidwayUSA, its Employees or any other organization. Customers should in no way infer that MidwayUSA has validated review information as safe, accurate or appropriate.

      NOTE: Prices, specifications and availability are subject to change without notice. We reserve the right to correct typographic, photographic and/or descriptive errors.

      Suggested Products