Manual

THE UNIVERSAL CASE TRIMMER

A metallic cartridge case will stretch after a number of firings and it then becomes neces-

sary 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 adjust-

ment 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

Insert pilot into

cutter head and

lock in place with

allen wrench.

Figure 13.

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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..
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Universal Case Trimmer (continued) steel alignment ball, the case will snap into position with the cams engaged in the extractor groove. Be certain the case is straight and that both cams are engaging evenly. Slide the cutter shaft in so the pilot enters the neck of the case and cutter face is touching the case mouth. Then, rotate the check lever to “lock” position. Do not use excessive force when locking the chuck. Slight thumb pressure on the lever is sufficient to hold the case firmly.
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Universal Case Trimmer (continued) Maintaining the Trimmer Powdered graphite or light oil on the cutting shaft will provide proper lubrication for smooth operation. A light film of oil or grease will protect steel parts against rust. Power Adapter Instructions An optional adapter is available to quickly and simply convert your Universal Case Trimmer to a power trimmer (Item #7862001). To install, first securely mount the case trimmer on a bench or table.