This is easier if you use Silicone Mini Ice Cube Trays 160 Small Ice Cube Molds like CB member Slide previously posted. This way you don't have to make UHMW posts for cutting/punching out the holes, just set the mold on a flat surface, cut/punch the holes, flip them over on non-stick paper, load, bake.
My mind works a little differently than his
BTaT- Trivets https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Hollow Punch Set, 6 Pc. https://www.harborfreight.com/6-piec...set-67030.html
[ I also use these for cutting/punching lubed wads for BP loading]
UHMW plastic (cutting board) cut a small piece 1/2x1/2x3 inch, mark one trivet cavity with felt marker then lightly press the UHMW on it giving you a outline then saw/cut a 1/8 inch post around the mark.
Center the post under the punch on your drill-press and set the stop so you don’t go too deep into the post.
I chose a slow speed then drilled/punched out all the holes.
Coat your boolits as usual and sift off all excess PC.
Set the trivet on nonstick sheet , and fill the holes with 223 boolits