I usually hit it with a needle file first to do the bulk of the heavy lifting then varying degrees of sandpaper. Wet/Dry sandpaper with windex on it works awesome. You can true up the straight edges with a flat surface and a sheet of 360 grit wet/dry and get really nice blended radii.
I went with a pretty heavy break on most of it. Whatever was appropriate for the part. Some of it looks better with less, some better with more.
Here's 3 recent pix of the frame...
It's hard to tell by the pix but there's a fairly heavy break, probably .02 on the back of the grip that extends clear up to the beavertail. It feels wonderful in the hand. I also relieved the grip to clear my thumb during mag changes.
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