We can look at page 13 of this presentation: http://water.epa.gov/type/groundwat...racturing/upload/casingperforatedoverview.pdf
DIfferent gun OD used for different casing OD. Getting larger as both go. I don't know how rare the 7in is and all I can think off is having a larger OD gun is better in this case as not leaving big gap between the charge and the steel casing.
Here comes 100 share trading again, page-29
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