Yes, you can always seat the bullet deeper but then you end up with 350 Rem Mag performance.
I get significantly more than 350RM levels in my 350WSM (35 Sambar) - 250s at 2740MV (around 4100 ft.lbs and
a Taylor KO 35) and 310s at 2450. Case capacity over the 350RM is vastly improved and in a shorter case too - my notes on that -
http://35cal.com/350wsm.html Not sure how well it would fare in a BLR. But if it eats 325WSMs then should digest the 358 flavour I guess too. As mentioned, barrel thickness may be a rebore issue - or not(?).
