H&H made .400H&H would be nice but price ..........,I have a Winchester M70 Pre64 .375H&H I could convert it to .400H&H but a new Winchester or Dakota would be a better idea. Time will tell if the major rifle companies take it up. A set of rifles in the following would be a good collection

.300H&H
.375H&H
.400H&H
.465H&H

Left Hand of course!

Steve