Any low D whistle makers other than Copeland that use the conical/tapered bore?
Tony Dixon.
Sweet has a somewhat conical bore but it’s not as obvious. Shaw makes one if you have lungs the size of Japan. Carbony makes one.
I’m not advocating for or against any of these, just answering your question.
ecohawk
Also, Walt Sweet Onyx and Bleazey
At the low price end the Sweetone and the original Clark. And, the Lo D Walt Sweet Onyx too.
Not in Low D (see the OP).
Me bad… 
