What about IVOMECEPRINEX
Pour-On for Beef & Dairy Cattle. I have used it for taking care of mites. Every little bugger is gone in 24 hours with no withdrawal time as per label. I assume that it handles the worms as well since it is used to deworm cattle. You can find it at jeffers.com
I used to use this, with very good results, and no egg withdrawl, either.