IHNSA was a big thing in the west in the 80's and part of the 90's, then when the Canadian directorship was appointed to Ontario, everything stopped in the rest of Canada. A few in the Maritimes were shooting in Maine, but the border boys weren't happy. Now, if we could could get some Canadians as IHMSA members and lobby hard to the CFO's to allow the steel targets on ranges with good berms behind, it might stand a chance. I started shooting silhouette in the late 70's and have watched it die, partly because of the director, and a lot because new shooters don't want to practice sufficiently to become serious long distance shooters.
We still do a bit here, but often you'd think no one owns a .44 anymore!