The only bar I've ever heard of being drilled & filled are the extruded Engelhard like the one they show.
So while it may be true that poured bars can either ring or not ring as shown in this video, what I seem to recall reading is that drilled and filled Engelhard bars DO NOT ring.
We are like children who look at print and see a serpent in the last letter but one, and a sword in the last. --Severian the Lame
Ciccio
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So while it may be true that poured bars can either ring or not ring as shown in this video, what I seem to recall reading is that drilled and filled Engelhard bars DO NOT ring.
--Severian the Lame