Newton was a pioneer in creating rounds that were considered screamers in their day. My granfather was a gunsmith...one of his prized possession was a rifle in the 30 Newton round. I just remember that as a kid the cartridge looked as big as grandads fingers. I never fired it though. It's much like a fatter 30/06 round and while it was quite potent...with the 300 H&H 300 Weatherby and others of that ilk..there was little reason for the 30 Newton......