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Hornady high speed 3 in 1 case trimmer

I stand corrected here. I didn't realize using sized vs unsized cases would make a difference.

I'm still getting a little bit of deflection somewhere that's causing the inside chamfer to be slightly uneven on some cases, but I got significantly better results using Lapua cases that I had ready to load. Overall, I would say I am satisfied with the results and the chamfer/deburr look significantly better than the images above showed. Similar to what I'm getting with the Lyman hand tool.

1.91201.91201.91201.91151.9110

Before running these last 5 cases through, I noticed that the set screw for the handle/collet holder was slightly loose and likely contributed to the anomalies I was seeing before. I'll probably unthread this and add some blue loctite to it to prevent this in the future.
Another thing that can result in uneven chamfering or deburring would be the variation in neck wall thickness. Combine that with some other issues and. . . .???
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Hornady high speed 3 in 1 case trimmer

I stand corrected here. I didn't realize using sized vs unsized cases would make a difference.

I'm still getting a little bit of deflection somewhere that's causing the inside chamfer to be slightly uneven on some cases, but I got significantly better results using Lapua cases that I had ready to load. Overall, I would say I am satisfied with the results and the chamfer/deburr look significantly better than the images above showed. Similar to what I'm getting with the Lyman hand tool.

1.91201.91201.91201.91151.9110

Before running these last 5 cases through, I noticed that the set screw for the handle/collet holder was slightly loose and likely contributed to the anomalies I was seeing before. I'll probably unthread this and add some blue loctite to it to prevent this in the future.
The other thing that might improve things is to leave the collet loose until the neck is on the pilot. So hold the case in the collet, run it onto the pilot, tighten collet, then trim.