Casting a bass bug is basically the same fly casting technique as casting a trout fly except for the changes in timing and rhythm made necessary by the much greater air resistance of most bass bugs. If your rod, line, leader and bug are properly balanced, I’ll show you how to do that later, you can execute with a bass bug every cast I’ve told you about. You’ll have a little difficulty with the positive curve casts because of the extra air resistance, but even those can be “wangled.”
A bass bug travels through the air more slowly than a regular fly. For that reason you must give it more time—more time on the pick-up—more time in the back cast—more time in the pause for the line to straighten out behind you—and more time on the forward cast.
Be sure to get the line and leader moving towards you on the water before making the pick-up. A small left hand pull on the pick-up helps even more with a bass bug than with an ordinary fly. Again, an easy left hand pull on the forward cast overcomes some of the air resistance of the bug. You can use a more powerful thumb-pressure at the end of the forward cast than with a trout fly.
As in casting a trout fly, remember to let the rod do most of the work. A bass bug rod has a world of power; and a bass bug is a slow-rhythm performer, so don’t hurry it. A slow, powerful cast does it.