Subject: Camshaft bearing problem

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I am fitting new camshaft bearings from the club, they have a groove which lines up perfectly behind the hole for the lock screw and I assume that the lockscrew goes into that groove, not too tight so that the bearing stays aligned with the camshaft and doesn't rub it, but far enough in to prevent the bearing from spinning with the camshaft. This set-up has worked very well on my car for a long time, but another problem forces me to change the bearings on the exhaust side.
However, somebody told me that I should drill holes in the bearings for the lock screw and that the grooves are not for the lock screws but for draining oil out of the bearing. I do not quite understand that because the rear bearing also has the groove but that bearing has an internal spiral oil channel. Besides, it would be best if oil did NOT drain from the bearings but stayed in. Does anybody have an idea what is the correct method? Must I drill new holes myself or is the groove an improved way of securing the bearing?
Also, I have no idea how the oil actually gets into the bearing...