Faced with the prospect of trimming upwards of a thousand cases, I decided to automate the process.

I took an L.E.Wilson case trimmer and put a spindle on the cutter. Mounted it in the 9" drill press.

Two trimmers are shown, an original and my modified.







Works well, takes some 'touch' to keep within +/-.001". +/-.002 is easy.

A handy way to do it that you rigged up.

I also use electric power with my Wilson trimmer(s)..I just take the handle off the cutter and chuck the cutter in a Makita (or similar power) electric drill. Wilson also sells an inexpensive adapater to chuck in an electric drill, if one is worried about buggering the threads for the handle on the cutter.

When used in combination with a Sinclair mount for the Wilson trimmer, it is especially quick to set-up and a snap to use.

Forester makes a vertical holding device that adapts well to drill press work and at times I've has three drill presses running all at once...one trimming, one id chamfering and one OD chamfering.

One can process a heck of a lot of cases that way.....back in the days when I actually took 3,500 rounds of 223 on a dog hunt to South Dakota that kind of case trimmer was a great help

The idea that one has to hold the cases to +/- .001 or even .002 is pure malarky.....unless possibly one has a reason to crimp and I've never found that to be necessary.

I so detested case trimming and deburring that I trimmed them once to minus .030 and shot them until they needed trimming again...or other reason such as split necks etc...then I discarded them and started over.....trimming to minus .030 with new cases.

Make no mistake here.....cases trimmed to +/-.005 are not less accurate than cases trimmed to +/-.001.....at least not in my testing!!!

I say this because the forester rig I used didn't get me the accuracy of the Wilson trimmer.....and I didn't find the accuracy of value!

Good info!

I spent 26 cents for the nut, welded a short piece of stainless on it and trued it up in the lathe (because I was unaware of the availablity of Wilson's extension).

I have been under the impression of the relative insensitivity of case length to accuracy, but eliminating or limiting ALL the variables is part of my quest for cast bullet (and j-bullet) accuracy in a couple of my shootin' irons.

Just bought (yesterday and a gun show) a gear-reduction motor with a collet that grips the base of the bullet and two (rough and fine) adjustable to .0001 neck outside diameter cutters (the orange ones) for $75. Using it it's fast to inside and then outside chamfer using the RCBS or Wilson tool. (I'd thought seriously of putting up two motors with arbors to hold the chamfering tools.)