Since the press is all warmed up.. how about the .416?
I'm digging the 6.5, but all the Instagram operators would whine as it would damage their A36..... oops AR500 targets.
Bad picture but here's a 416 Boondoggle next to the 358, should come in a little behind the 416 Taylor. I don't have any 416 bullets around to show a loaded round.

I'm more surprised you own a 6.5 creedmore
No Creedmoor, but I used the 6.5 Creedmoor brass to form 270 AR cases.

I wouldn't slum it with the Creedmoor....
Ever thought of just necking up a 325 WSM to 338? Should give you about the same result but with a little longer neck.
I played with a 338/300 WSM for a while and it was pretty much the same performance that I'd get from this. I've always felt that the narrower Ruger case fed smoother through push feed actions than the WSM.