OK, now I understand your question.
Yes, you will lose some depth of cut using a bushing because it is designed to follow a template. The template must be at least as thick as the bushing and I believe the minimum thickness is generally 1/4".
That being said, there are ways to go from template/bushing to pattern bits that will allow for greater depth of cut.
Clear as mud?
Artisan Woodworks of Texas- www.awwtx.com