Not sure if this belongs here or in "big Bores" but,
If one turns the belt off is there enough shoulder to headspace on the shoulder. It looks borderline to me. Rim would be turned down slightly as well to feed better.
I am not interested in answers of "why". I have reasons that are valid to me and the headspace is the only issue I am interested in.

Good question. I used to own a 450 Ackely and after looking at a loaded round I don't think I could trust it to headspace off the shoulder.

No, the headspace is too thin

if one started with the 404 or rum case this is fine, as their case width is more or less the belt width of a HH case. picks up like .030 more potential shoulder

460 GA, i believe