You might want to also check out the 7/32 Dazl eyes if you aren't concerned with having jig with a pupil and a iris.
Also check and see what is available in Tungsten dumbbell eyes. They won't be inexpensive for sure.

As Coley said, the lead eyes are probably the heaviest that you will find.
The only downside to them that I've found is they aren't very durable, at least in the smaller sizes. They have a tendency to break in half and I no longer use them.

Good luck,
SF
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