Winchester M70 Classic CRF rebarrel

[Hurricane]

First post, new to forum
I'm new to the Creedmoor chambering, but it's going to happen this summer! I'm a Winchester guy and the downer action is a factory box mag mid 1990 Control Feed bolt gun.
First question,,,, how long should hunting barrel finish out at.
I also like breakers on my rifles ,,, looking at a VAIS ,,,, any thoughts?
I'm looking at a #4 contour Willison Arms from Ragged Hole Barrels. Romberg it's a hunting rifle,
I have a 6.5-284 Heavey 30" Krieger for mid to lond range target work. It shoots better than I read wind.
I also load my own and would like to hear about your pet loads. Looking for terminal load for hunting.
All thought are  appreciated

Thanks
Hurricane
Southern Louisiana Guy