Baz NZ,
I'm using RL-17 in the 30-06, and for bullets, the 208 Amax, and 215 Berger.
I've found excellent accuracy at 54.0 gr. 2650 fps from a 20" sporter, and 2700 fps from a 22.5" heavy barrel. The heavy rifle keeps them well under 1 moa, typically .5 moa.
I'm a long range shooter, but not really a long range hunter. I like to know what my abilities are though.
My heavy 30-06 was 26" originally. I was loading 60 gr RL22 under the 208 Amax for 2800 fps. Fun rock-shooting load way past 1000 yards. I've had success at a mile in fairly calm and dry conditions. Eventually I cut to 22.5" and braked it. At about the same time I consolidated on RL-17 powder for both my 308 and 30-06 loading. So my current 30-06 load is 54.0 gr RL17 under a 208 Amax, or 215 Berger. Getting about 2700 fps in summer, 2650 or so in cooler temps.
So, I ve given up about 150 fps. But given the high BC's of the bullets, they still shoot very well to 1000+ yards.
For 600 yards, you would have a VERY solid load.
Always start low and work up with normal cautions. I'm using Norma and Winchester brass, CCI 200 primers, and moly tumbling my bullets.
A couple pics of the light and heavy 30-06s
Here's a (poor quality) video I made a while back. Shooting the heavy 30-06 at a rock about 6" diameter, at 1198 yards. This was the 215 Berger over 54 gr RL-17.
https://www.facebook.com/video.php?v=85 ... nref=storyShane