THE UNIVERSAL CASE TRIMMER
A metallic cartridge case will stretch after a number of firings and it then becomes necessary to trim it back to its proper length so it will chamber properly. The Lyman Universal Case Trimmer accepts all U.S. metallic cases. To convert to another caliber you need only change the pilot. Also included is an Allen wrench, which fits the lock screws in the adjustment rings and cutter head..
Mounting
The base casting is drilled so the trimmer may be fastened directly to the top of your reloading bench. This is the recommended method of mounting. Some reloaders prefer to clamp their trimmer in a vise when using it. If the trimmer is to be used in this manner, Lyman recommends that it be fastened to a block of wood. The wooden block can then be held firmly in the vise jaws without damaging the base casting.
Installing the Pilot
Loosen the lock screw on the case trimmer’s cutter head, open the package containing the Universal Trimmer pilot and insert it all the way into the cutter head (see Figure 13). Now tighten the lock screw.
Preparing the Cases
Before trimming, cases must be full-length or neck-resized and deprimed. Pilots are designed to be used only with sized necks.
Measuring the Cases
You will need an accurate means of measuring case length. We recommend that a good vernier caliper be used. When your cases have lengthened to the point where they exceed the maximum case length allowable for your cartridge,
they must be trimmed. For a list of “Maximum Case Lengths” and suggested “Trim-To Lengths” see your Lyman Handbook.
Locking the Case in Place
Place the chuck lever in “open” position and slip the head of your unprimed cartridge case into the chuck head as pictured in Figure 14 (pg 38). By pressing the rim of the case against the side of the
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