I vote for the Bushing Die, But I would also order a tight chamber reamer and turn necks. At the very least cut a minimal amount off the neck to clean it up and make it uniform. A non Bushing die overworks the brass by sizing it too small, you also do not have any control over neck tension. Harrels is a reputable place, I've never had any of their products but always here good things, I do have dies made by Whidden Gunworks and like them a lot, they also make a real nice Comp seater die. Although for a hunting rifle I would probably not go with the comp seater. I guess it just depends how fussy you are with reloading. My bullet seating process for match guns is a bit extreme and comp seaters make it a much easier task
All my bushing dies are floating, can't really say was aware of a screw in type? And all my dies are screw in, I do not have an arbor press, a lot of my friends look at me in dis-believe at matches over it. I have too much invested in Dies at this time to begin switching over to an arbor press. Unless my results take a drastic nose dive I'll keep using screw in dies. If I were starting from scratch I'd have an Arbor Press.
Unfortunately I have to disagree with Tony, the only thing the expander ball is good for in my opinion is to hold the primer plunger, or what ever it's real name is.
What action and Barrel combo are you using?
You should bring this beast to Ridgway and smoke a few silhouettes, a 260 Variant should work well there