McClellan transformation offers a computationally efficient scheme for 3-D post-stack depth migration. The accuracy of the response of the McClellan filter is improved by rotating and averaging the filter. We have implemented the McClellan migration with the improved circular response and tested it on real data, a salt intrusion example. The migration collapses the diffractions, thereby delineating the salt and fault boundaries. The migration results obtained using different McClellan filters show only slight differences because of the limited dip and frequency range in the dataset we used for testing the algorithm.