12 Gauge Shotgun Hull Trimmer

I got sick of the varied lengths of the 12 gauge hulls I reload (I use Win AA, Peters and Rem STS) and the way that affected my final crimp. Too long and they pinwheel, too short and I lose a BB or two. So I came up with this tool. This is set up for standard 2-¾" shells but is adjustable as you'll see. Works pretty well actually. You will need a single #10 screw (to hold the knob onto the cutter-handle) and a few 3mm screws which you can see in the pics. The holes are threaded in the model so you can see what you need for screw types. Note that the longest of these 3mm screws is intentionally extra long with the intent that it is your overall length adjustment so it needs some friction to stay set at your desired length. The head of this long screw is to seat in the pocket of the base so you don't want it turning while you use the tool. You will also need a #11 craft blade which are the smallest craft blade you can get (that I could find). You can find them on Amazon at about 8$/100. When it gets dull just put in a new one. You need to decap the hulls (remove the spent primer) before using this. And there are two bases included - one for mounting as you see in the pics, and the other to hold in the hand instead. This was fun. I hope you can get some use out of it. I think a good revision to this would be to use a regular box cutter blade instead. Two tips on those, and probably a better edge. Maybe I'll get around to that later... Or you try it.