Hell of a good idea putting it in a #4. Just happened to have one sitting at idle in my lockup. Currently, a .312 Express (.350 Rem Mag necked to .312), but opened to .416 might be a good idea.
That particular round is now called the 10.6x51. 300gr. at 2,300fps+ and 330gr. at 2,200fps +. Trim to length is 2.00". A lighter, stubby 275gr. bullet reaches 2,450fps.