Dillon RT 1200 Case Trimmer on a Hornady LnL-AP Press

Dillon RT 1200 Case Trimmer Hornady LnL-AP Press

Dillon RT 1200 Case Trimmer Hornady LnL-AP Press

With 3000 untrimmed cases staring at me, it was clear that I needed to step up my ability to trim cases.  After much-back-and-forth between the Giraud and the Dillon trimmers, I chose the Dillon.

The main reason is that it becomes part of the size-and-decap process, meaning cases now get trimmed without an extra step.

Giraud Chamfers & Deburrs, the Dillon Doesn’t

I think the Giraud is the more precise tool.  It also chamfers and deburrs both the inner and outer edges of the case mouth.

Some claim that the Dillon trimmer does not chamfer and deburr. In actuality, the Dillon’ cutting blade is mounted at a slight angle (I’ve heard 4 degrees) so that the outer edge has a bevel – which means no burrs on the outer edge.  I’ve examined several cases under an 8X loupe and so no burrs in the inner edge either. While the edges may not be as nice as the ones the Giraud produces, the Dillon is good enough.

In the attached photo, I have the Hornady Lock-N-Load-AP set up for case processing as follows:

  • Station 1: RCBS Lube Die (also de-primes the case)
  • Station 3: Dillon RT 1200 Trimmer
  • Station 5: RCBS Sizer Die (See Below)

I have the body of the sizer die backed way out so that it never comes in contact with the case.  The reason it’s there is so that the expander ball can do it’s job.  I also figure that if there are any burrs on the inner edge of the case mouth then the expander ball will knock them off.

The video below tells the whole story:

Comments

  1. Nick says:

    Thanks for the great info on your site.

    I’m just getting into reloading rifle (223) on my Hornady LNL and your video is very helpful. I have some questions if you don’t mind.

    What is your process of reloading 223? After tumbling the brass, does it go straight through the setup in the video? If yes, do you tumble again after that?

    Also, once you are done with the step, what exactly are the dies that you are using for the next, final step? Thank you.

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