Lyric discussion by JumpHaround 

Cover art for Crow Jane lyrics by Nick Cave and the Bad Seeds

The "measurements" are actually guns, surely? It makes sense with the mention of Smith & Wesson, and the period before the number (only noticed that after looking at the lyrics)

I can't really add anything more, except it seems that the miners forgot about it (either through time, or maybe just because they were drunk because of the whiskey) - "seems you've remembered how to sleep". The narrator presumes they would not be able to sleep if they knew what they had done.

@JumpHaround "Seems you remembered how to sleep, how to sleep" refers to Crow Jane. After she's raped by 20 miners, she has "horrors in her head, that her tongue dare not name." After she takes her revenge, she's able to sleep. She has peace.