Most common glass for beads is probably 104 COE.
If you are using 33, that is borosilicate, and it takes a lot of heat to get it to move, but people do make beautiful beads with it.
COEs 96 and 90 are harder than 104, but nothing like 33. 96 and 90 both have beautiful colors, although there may be a little steeper learning curve from what others have said.
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