Jan 2, 2017
as of 1/2/2017
You would need 256 regular drums to hold the same amount that ONE bedrockium drum holds. Assuming my math is right...
Mats cost:
compressed cobble = 9 double compressed cobble = 9x9 = 81 triple compressed = 9x9x9 = 729 quadruple compressed = 9x9x9x9 = 6561
one bedrockium ingot = (4)triple + (4)quadruple + (9)diamond (4x729) + (4x6561) = 2961 + 26,244 = 29,205
one bedrockium barrel = (6)bedrockium ingots + iron cauldron + (2)gold plate
29,205 x 6ingots = 175,230 cobblestone for one barrel.
That's 2,738 stacks of cobblestone. Do not attempt without a quarry. I also recommend Steve’s Workshop tables to automate the process.