ELR Gen 3 Powered Case Trimmer Cheytac / XC COMING SOON



Shipping Now: The New Gen 3 Trimmer With Single Speed Motor And all Billet Aluminum Mount


The Gen 3 powered case trimmer uses a powerful single speed DC motor.  The DC motor is extremely smooth and quiet and powers the spindle at around 1700rpms. Our  inclosed aluminum motor mount shroud bolts directly to the bearing housing.  We have also designed a custom machined pulley that is belt driven.

The DC motor offers maximum torque at 1700rps where you need it most.  The DC motor also offers smoother and quieter operation.  The motor has an in-line on/off switch for easy control.

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The trimmer is fully machined from 6061-T6 aluminum and 300 series stainless. The unit is overbuilt from the ground up requiring minimal maintenance while providing years of hard use. The Tri Trim case trimmer includes one Brown & Sharpe-style collet. The following ELR cutter heads are available. (.338, .375, .408,).

o    Extremely consistent and will repeat to within 0.002″ with same brand brass
o    Brown & Sharpe-type collet
o    Taper-Lock cutter 14deg inside chamfer 30deg outside chamfer
o    Single speed custom-built DC motor



Collet #4 – ( .605 Dia)

300 Norma Mag, 338Lapua, 33XC, 37XC

Collet #5 – (.640)

.375 Cheytac, 408 Cheytac

The Tri-Trim Gen 3 Case Trimmer utilizes The Taper-Lock cutter head to create clean, consistent and completely trimmed cases in one operation. The cutter head has adjustable carbide blades that will last a lifetime and leave burr-free cuts on the mouth of the case. The Tri-Trim Gen 3 Case Trimmer itself is machined from 6061-t6 aluminum and a combination of 303 and 416 stainless steel. It has been engineered and manufactured 100% in America for a lifetime of service to the end user.
Case preparation is a necessary evil in the reloading process. The trim operation for rifle cases is especially time consuming unless you are using a Tri-Trim Gen 3 Case Trimmer. It is designed from the ground up to make trimming cases easy, fast and accurate. The cartridge case it held by a Brown and Sharpe type collet by the rim. These types of collets are used in the machine tool world because of their accuracy and repeatability. There are 2 collets for .338 and .375.  The cartridge case is placed into the collet base first and held in place while the handle is tightened to secure the case for the trimming operation. It only takes about ten degrees of rotation for the handle to secure the case and this design holds the case in the same position regardless of the rim diameter for consistent trim length. The collet assembly is mated to a carriage machined from solid 6061-t6 bar stock and precision fit to ground and polished stainless rods. The spindle is machined from stainless steel and rides in a set of sealed ball bearings which are press fit into the bearing housing which is also machined from solid 6061-t6 bar stock. All the aluminum parts are anodized.   All the fasteners are black oxide coated and sourced locally.

The Tri-Trim Gen 3 Case Trimmer will come with one cutter head and collet for the desired cartridge and will need to be set up before use. Before any adjustments are made to the Tri-Trim Gen 3 Case Trimmer, make sure the power source has been removed. The protective cover may be removed for the adjustment procedure by must be used while in operation to prevent injury to the user. The Taper-Lock cutter head is factory set. If the carbide blades need adjustment, it is advised to return the cutter head to Henderson Precision for adjustment. To set the length, insert a cartridge case into the respective collet and tighten handle. Gently push the handle forward toward the cutter head until the mouth of the case passes over the pilot and touches the blades. There are four socket head cap screws supplied with the trimmer. With the case mouth touching the cutting blades, hold one of the screws up against the stop with the threads toward the cutter head. With the head of the screw touching the carriage stop there should be about ½” of threads that can screw into the spindle housing stop rod. Retract the carriage and screw in the correct stop screw. Make sure the lock nut is backed off far enough to allow the case to touch the cutter when assembled. Once the stop screw is adjusted to allow the case to, once again, touch the cutter blades tighten the lock nut up against the stop rod. This is a coarse adjustment and should only take about five minutes. Install the protective cover and power source and attempt to trim your case by pushing it toward the cutter head. If it does not trim remove the power source loosen the lock nut and turn the lock screw in a small amount and attempt another trim cycle. Repeat as necessary until the cartridge case is trimmed and then measure and adjust as needed to attain the desired length. Once the length is set it will not need to be adjusted again. When changing to another cartridge just loosen the lock nut and remove the lock screw as an assembly. It can be marked for the cartridge it was used for and then used again when needed.
The Tri-Trim Gen 3 Powered Case Trimmer is designed with a custom DC single speed motor that poweres the trimmer at around 1700rpms.  It is preferable to screw or clamp it to your work bench. When in proper position for use, the Tri-Trim Gen 3 Case Trimmer will be positioned on a bench with the cutter head facing toward the operator. When facing it, the cutter head will rotate in a counter-clockwise direction.  Insert a clean and sized cartridge case into the collet and rotate the handle clockwise, hand tight to secure the case. Gently push the handle toward the cutter until the cutter head engages the case mouth. At this point you will feel the cutting action. When you no longer see or feel the cutting action, retract the carriage and loosed the handle to remove the case.  It is recommended to measure the cases randomly to make sure all adjustments are secure. Once adjusted, The Tri-Trim Gen 3 Case Trimmer will repeat within +or- .002” with the same brand of brass. Enjoy your new Tri Trim Gen 3 Case Trimmer and if you have any questions, make sure to contact us.

Cutter Calibers

204, 223, 243 (6mm), 25 cal, 264 (6.5mm), 277, 284 (7mm), 308, 338


#1, #2, #3, #4

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