Originally Posted by jackdale
....I just use a bowline with a safety hitch and then clip the shackle to the harness when I ascend.......
Since this reads funny, I'm sure you don't mean that you tie the line to a shackle and then clip the shackle to the harness. Your line has a pre-spliced shackle on the end. You tie the line directly to the harness. The shackle is on the bitter end of the knot, which you clip to the harness for safety so it can't back through and undo the knot.
I'm sure that's what you meant, just thought clarification might help.