I don't own a Howa 1500, but from what I've read they're a solid value, and deliver decent accuracy.
If it will shoot sub-minute, that's "good enough" to bang steel at 1000. Not going to win you any competitions, but it'll work. Your understanding of external ballistics- wind calls- will be far more important in making hits than the inherent accuracy of the rifle. I can bang a 10" plate at 600 yards as fast as I can rack the bolt- but nary a hit on a plate twice as large at 1000. Those last 400 yards are very challenging- and it's not because of the rifle.
My question would be- how accurate are you with the .300 WM? It's one of the more "capable" long-range calibers- but rough on the shoulder. Most guys I've seen shooting them (sans brake) are done after 30 or 40 rounds.
For me, it's all about the practice of sending lead downrange- 100 rounds per trip at a minimum. Practice, Practice..
I'd go with one of the lighter recoil calibers popular for 1000- like the .260, 6.5 Creedmore, 7mm-08 (mine), or any of the other 6.5's or 7mm choices that'll be easier on the shoulder than the .300 WM. JMO...
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