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The RCBS Trim Die doubles as a visual case length gauge. Run a case into the trim die and if the case sticks out above the top of the die, it's too long. File the case down until it is flush with the top of the die and then debur. Headspace is held to minimum tolerances to avoid changing the length of the case. The Trim Die is case hardened and hand polished. Heat treated to withstand a file bearing against the top surface without damage to the die. The Cases with an overall length of 1.700" and shorter require the use of an Extended Shellholder. Shellholder sold separately.