Reviews & articles for shooting sport enthusiasts.

Posts tagged “case prep assistant

Is this the cure that prevents countless hours of suffering?

“The cure to what?”, may be the first question popping into the thoughts of TPF’s readers. In this case, it is the cure to the single most complained about, biggest headache for anyone who reloads rifle cartridges. Besides the tedious task of collecting range brass and cleaning it through various means, there are many steps to preparing a spent rifle case before ever assembling a new cartridge for use.

The Steps for reloading rifle cartridges:

  1. Collect spent cases: Go pick up your brass and if you are lucky, everyone elses!
  2. De-prime cases: Can be done after step #3 depending on cleaning methods and press types
  3. Clean cases: Degree of cleanliness is dependant on the reloader themselves. Wipe off, dry or wet tumble, ultrasonic cleaning?
  4. Size cases: Full or neck only sizing is another factor dependant on the reloader’s desires.
  5. Trimming brass: Cutting to length and possibly chamfering inside and outside of the case neck.
  6. Re-prime case: By hand or by press
  7. Powder charge: Check the type of powder, as well as the levels in the hopper/scoop. Also do not under or over charge the case!
  8. Bullet seating: Make sure your OAL allows proper feeding!
  9. Bullet crimping: If necessary and do not over crimp!

So the biggest headache? Step 5. Trimming…

Trimming is the simple procedure in cases preparation that involves the shaving of brass down to specifications for most calibres as set out by Sporting Arms and Ammunition Manufacturers’ Institute, aka SAAMI. IF you perform step number 5, there are a huge number of methods available for an equally broad range of retail pricing. However the product on today’s TPF plate for reviewing is the Trim-It II.

The box!

The trim-It II as packaged

Direct from the website the features of the Trim-It II are listed as:

  • Built-in micrometer adjustment for cut-length control
  • Interchangeable die system, allowing you to trim a wide range of cases with one unit
  • Adjustable cutting tool with 3-sided carbide blade that allows for a 15 degree inside case mouth chamfer and 45 degree outside chamfer
  • Machined from 6061-T6 Aluminum. This baby is built to last.
  • 100% Forever (plus 90 days) Guarantee. 
  • Made entirely in the good ole’ US of A!

The Trim-It II that TPF obtained came is a small, compact cardboard package which contained everything needed to start trimming. OK. Almost everything… Like most reloading apparatuses, the basic unit does not come with the calibre specific components such as sizing dies and the like. This product is no different, and offers calibre specific bearing dies for many of the most common hunting calibres, pistol calibres, and some of the more popular long range benchrest calibres that are used.

The kit needed

What you get in the box, plus a calibre die

The original Trim-It had a micrometer adjustable depth ability and a four bladed flush cutting head that did just that, trimmed cases to the user’s set length. The secret to both the Trim-It and the Trim-It II? The calibre bearing die. For this review, TPF-Online decided to use the ever popular .308 Winchester round for trimming. Having many, many hundreds on hand to be converted from fired brass condition into usable ammunition was just a stroke of luck as we would never just go out and discharge .308 Win by the scores just for reviewing a trimmer… OK, maybe we would… Alright… We did… And it was worth it! So lets start by explaining the components that you receive in the package when a Trim-It II is purchased… Plus the .308 Win Calibre Die.

  • Instructions, 2 pages double sided
  • Allen keys, 4 of varying sizes (0.050″, 1/16″, 3/32″, and 9/64″)
  • The cap/barrel assembly
  • 3-way cutter
  • Calibre die, .308 WIN (sold separately)


These are likely the cheapest component of the entire set. Now these two pages seem to be simple double sided photocopies that are folded into 1/8 the original size to fit into the box. One page contains the product warranty details and a fillable sheet for returning defective/broken products. The other sheet is the one that is most important to everyone that is reading… A parts list and instructions on how to assemble, tune, and utilize the Trim-It II. The instructions for this are only on a single unfolded side and also contain the instructions for refitting the original Trim-It with the new 3-way cutting head. Opposite the instructions is a parts list diagram of both the Trim-It and Trim-It II.

Allen Keys:

The L-shaped hex drivers for adjustments and locking in components with set-screws. You knew this already however, so not going to say any more on these parts…

Cap/Barrel Assembly:

So the cap serves two purposes, both of which are important for the functionality of the Trim-It II. First is the mount for the 3-Way Cutter that is secured along the cap’s centreline with a set screw. This forces the cap to rotate with the cutter when under power. The second purpose is to act as the threaded mount for the barrel part of the assembly. The barrel houses the Calibre Die, and because it is threaded into the cap, allows for fine distance adjustment for cutting brass to the proper overall length. The barrel has numerous openings which allow adjustment to the cutting head as well as a path through which trimmed shavings can be removed. The barrel has an external o-ring groove which holds the clear polycarbonate sleeve in place to prevent shavings from flying everywhere when in use. A set screw locks the barrel depth into place as well as locking the calibre die into its groove.

The 3-Way Cutter!

The miniature boring head with carbide insert

3-Way Cutter:

The three way cutter is a miniature version of a milling machine’s adjustable boring bar. The cutter insert itself is a simple triangular insert whose corners have been cut to a V shape to trim both inner and outer chamfers and thereby also the length of any brass casing. TPF-Online did not remove the insert, but the V shape is on all three corners of the insert meaning that if you even wear down one of the cutting profiles, you can rotate and have a new cutting profile to be used. Twice… Since these are only trimming brass versus the insert’s carbide, it is likely to last for generations of shooters. The mounting head of the cutter is adjustable itself, with the insert able to be shifted towards or away from the centerline of the cap/barrel. This allows for different diameter necks to be trimmed, but unless you have several of the cutters pre-set, re-adjusting the cutter for each new calibre introduced is required.

Calibre Die:

These are sealed bearings that are modified by machining a custom inner ring to accurately position brass for trimming. These are precision tolerance bearings which are aligned by the barrel groove machined to exacting tolerances. with the outer ring of the die secured with a set screw in the barrel, the inner ring is free to rotate independently of the cap/barrel/cutter assembly.

A .223/5.56 and .308 examples of Calibre Dies available

How it works… Aka steps for using the Trim-It II:

  1. Install the 3-way cutter into the cap/barrel assembly so that it is as close as possible to the cap and secure with set screw against the flats in the shaft of the cutter.
  2. Tighten barrel into cap until it stops (“Zero”) back off until you alight the barrel index line with one on the cap. Unscrew barrel for one full revolution and lock in place with a set screw.
  3. Insert desired calibre die into place in barrel and lock it with set screw.
  4. Insert desired brass piece into calibre die.
  5. Loosen cutter set screw and move cutter until it touches neck of brass. Re-tighten setscrew.
  6. Slightly loosen cutting head set screw and adjust the position of the carbide insert so that the neck edge will touch the base of the V shape cutout on the insert. Re-tighten cutting head set screw.
  7. Loosen barrel set screw and adjust for height. Re-tighten. Each mark on the cap equals 0.002″ travel.
  8. Install into a drill, drill press, dedicated rotary tool, etc… Ensure the drill turns clockwise, otherwise cutters will not work properly.
  9. While drill is running, insert brass case into calibre die. If not trimmed to the right length shut down and adjust barrel as per Step 7.
  10. Go trim happy… When you don’t hear the inserted brass being trimmed, time to put in the next piece.

It is a lot of work for setting up the Trim-It II, but once the tool is setup, the unit is spectacularly fast in doing it’s job. For those who only have a hand drill however, the entire setup will be hard on the hands.


  • Fast once setup
  • Nearly forty calibres available
  • Easily adjusted for OAL
  • Ease of cleaning due to the polycarbonate sleeve
  • Rock solid
  • High quality
  • Not expensive like a GTC Giraud Power Trimmer


  • Adjusting the V-notch could be easier to tune
  • Hard on hands if using a hand drill
  • Handheld brass case tries to spin while cutting
  • Not cheap like a Lee Zip-Trim


  • Table top drill press, or dedicated drive unit for the Trim-It that allows for two hands to manipulate and hold brass.
  • Design change for the carbide insert adjustment. Use a fine thread screw for adjusting distance from centre line.
In pieces

The components ready for assembly and adjustment. Soon to be followed by copious volume brass trimming…

The Trim-It II as reviewed is available from brick and mortar store locations such as Select Shooting Supplies in Cambridge, Ontario. Their listed prices are, at the time of this review, $189.95 CAD for the Trim-It II, and $29.95 CAD for each calibre die. Is the Trim-It II a worthy addition to one’s repertoire of reloading tools? Does it fall under the category of Tactical, Practical, or Fantastical devices for firearms owners?  That is a simple question that only YOU, the reader can answer.

TPF-Online wishes to thank Mr. Chris V. for his comments and additional input on this review. Between his efforts and those of TPF-Online, nearly 2000 pieces of .308 Win brass was trimmed in very little time.

Hornady’s Case Prep Assistant!

If you reload for rifle calibres such as .223 Remington and .308 Winchester, some of the most tedious jobs for such case preparation have to do with physically removing brass from the case to create a uniform case for consistent reloads. Trimming the case to length and chamfering the inside and outside of case necks, as well as any sort of cleaning/lubing done to the inside of the necks for a smother reloading process. This case prep is the laborious process which can make or break the spirits of many reloaders, as it really comes down to the old adage of “how valuable is your time?”


Either of these are cheap chamfer tools, but both are still 100% manual in operation.


In a small package, the tool awaits use.

Whether you spent next to nothing on a Bonanza Cricket chamfering tool, or purchased a more substantial Lyman chamfering tool, the big issue for shooters who have larger volumes of brass to prepare for reloading usually end up with sore fingers and hands from the twisting and repetitive action of manually chamfering each case. If you only have a dozen or so piece to do, it may not be so bad, but many reloaders have literally hundreds of cases awaiting these sometimes necessary steps for good reloading results. In this regard, once again Hornady has come through with yet another offering in their newest tools in the Lock-N-Load® lineup. Welcome to the Case Prep Assistant (CPA), a powered unit which drives a threaded shaft at a manageable speed and allows for batch jobs of brass preparation that will not leave a reloader’s fingers sore and their patience at an end. Constructed from an extruded aluminum channel which houses the switch, motor, gearbox and tool shaft the CPA should last for many years. Anodized in typical Hornady red colours, the CPA has 4 rubber base pads to give it a firm slip-resistant footing and shows off 4 nuts which are trapped along the outer tracks of the aluminum extrusion. These nuts are threaded for #8-32 which allows for a multitude of cleaning brushes and attachments to be stored directly on the unit itself.


The Case Prep Assistant as shipped.


110V or 220V

Hornady’s sales pitch is as follows: “Make case preparation faster and easier than ever with the new Lock-N-Load® Power Case Prep Assistant. Its durable brushed aluminum housing and high torque, low speed motor will provide years of dependable use. Included are chamfer and debur tools, with plenty of on board storage for optional case prep accessories like our primer pocket cleaners, case neck brushes and any other 8-32 thread tools. Unit is compatible with 110V or 220V power.”

While TPF is unable to test for the higher voltage, Hornady’s CPA comes with a standard two prong adapter that is used in many parts of Europe/Russia. When plugged into a 110V outlet and switched on, the motor and gearbox establish a final output shaft speed of roughly two (2) revolutions per minute. Included is a small flat wrench whose jaw size corresponds with flats machined into the output shaft. Use of this tool is recommended for any tightening operation as one should try and protect the gearing mechanism in the CPA. TPF has had much experience in accidentally stripping gear teeth that such recommendations are taken seriously and followed to ensure longevity and secure attachments.


A simple ON/OFF switch rides above the power connector jack.

The CPA comes with 4 sliding nuts which are used to mount/store all #8-32 threaded tools that are desired to be used with the tool. The current numbers and such mean that only five (5) tools can be attached to the CPA at any single time. The tool being currently utilized and four (4) additional ones that are secured via the nuts. Now it looks as though additional nuts can be installed by removing a plastic end plate which is secured with three retaining screws. TPF has not endeavoured to test this theory at this specific time, but it may be looked at after the testing for this overview.


Inside and outside chamfer attachments are included

With shaft output speed of approximately two revolutions per minute, Hornady’s Case Prep Assistant, is not a high volume production machine. It does however accomplish exactly what it sets out to be; an assistant to make certain case preparation tasks simpler, less tedious, and less time consuming. In this task it succeeds very well and requires a minimum of setup time to operate.  The simple linear design means the entire package is small and easily stored when not in use.  As stated, the only possible negative aspects of this tool are the lack of additional #8-32 storage provisions and the turning speed which may seem too slow to some users. Remember that the inside chamfer tool which is included has 6 cutting flutes and makes short work of inside neck chamfering, and the three prong outside chamfer tool only is used for deburring the case neck. For the other uses such as case neck lubing/cleaning just how fast does the brush need to be turning to properly be used?

Filling the #8-32 storage spots

It could be a fair tool for individuals looking to reduce the physical efforts and time used on case preparation, and ultimately requires multiple steps to be done in batches due to the required tool change-out

Hornady’s Case Prep Assistant is available from all retailers which stock Hornady products, such as The Gun Centre in Ontario, Frontier Firearms in Saskatchewan, amongst many others. This tool as reviewed has a listed MSRP of $120.88 USD.  As always however, it is up to you, the reader, to make your determination if this tool falls into one of the categories of Tactical, Practical, or Fantastical…

TPF notes that Hornady does offer a bigger brother to this machine, known as the Case Prep Center, which has case trimming and six (6) powered #8-32 attachment shafts for a full case preparation station. Of course with added features comes size and cost, but stay tuned, as TPF will have one up in review sometime in the future.