Masonry hammer drill would be my second choice, you just have to be careful once you penetrate into the block cell, you could hit a cell wall too, you will know quickly, masonry bits punch through block or concrete masonry units (CMU) very easily unless its high strength cmu.
Not too long ago I had to re-route a sump pump discharge line for my neighbor, through a hollow CMU foundation wall, a good friend who is a hvac/plumber, had a core bit set in his truck, I borrowed that and over sized the hole for a pvc sleeve and sent the sump discharge line through that, core bits do provide a neater hole, the masonry hammer bit could fracture or spall the opposite side, either will work, one may require a little patching. For larger holes, in CMU or concrete core bits are commonly used.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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