I started a 9.3x62 project several years ago. Ray Atkinson weighed in about bullets on another forum, and his advice was dead-on. If I remember correctly, the upshot was that the Speers were a little too soft for the 9.3x62, but it would be best to get it directly from him.
I went with the 286-grain Nosler after that and was happy with the results on several feral cattle at ranges from 30-120m.
Okie John