Problem Railcraft Firestone in FTB Ultimate Reloaded

[FyreRode]

I know that firestone spawns in the nether underneath the lava oceans, but I can't find any information on how far down? Is it all the way down to bedrock? or is it just beneath the lava? Maybe firestone is disabled in FTB Ultimate reloaded? Any help on how to find this stuff is appreciated because I can't find any information online that has more to say then "under lava ocean in nether". Thanks

 

[GamerwithnoGame]

My understanding was that you'll literally find it (albeit rarely) at the bottom of lava lakes - so if you imagine all the lava was cleared out, at the bottom where the lava was and an indentation now lies there should be firestone ore visible, if it spawns.

 

[KingTriaxx]

Is blood magic in that pack? If so the dome sigil works quite well for the task.