After doing research I found and purchased one of these guides!I personally subscribe to the “slightly rounded” vs. “sharply angled” look, myself...
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...but, as others have said, these things were hand made and all over the place, in terms of their look. If you do want that sharper angled look, there are some great 3D printed cutting templates available to make the job easier. Here’s one I picked up over for cutting the notches in Roy’s ESB grips that includes a template notch for cutting grip ends with a sharp angle.
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If I remember correctly, I think I noticed that the track were not all beveled the same. some were rounded, others more angular, and I can't imagine they're all exact 30 deg.
I actually use a medium metal file for the corners.