I've personally used and compared the Leica 1200 Scan and the Bushnell 1500 Arc side by side. Evidently the Bushnell's don't all have the same ranging capability. I've read a number of posts where some Bushnell owners get more than 1500 yd ranges. Others have trouble ranging 1000 yds. I never got more than 1000 yds from of the one I used. My Leica could get about 1100 under ideal settings and targets. The Leica glass is much much better than the Bushnell.
I currently own a Swaro. Ranges out to 1700 yds, possibly farther on ideal targets. It blows away either the Leica or or the Bushnell, both in range capability and optical clarity. I often use the Swaro RF as a monocular. The Swaro RF optics are as good as my Swaro 8x30 SLC binoculars, but in monocular form.
From my experience, if you want to range objects past 1100 yds, the Swaro is the only option of the three I've mentioned and used. If you get one of the good Bushnell 1500s, you might get past 1100. If you get one like my neighbor has, you'll be stuck at 1000 yd or less.