6.5X47L with a 129 SST did the deed at 675 yards for me this year. As said above, you need to shoot a lot. I shoot about 300 days a year, Several thousand rounds of center fire ammo every year.
On this shot, I watched the deer for about 40 minutes or so and watched the conditions the entire time. I needed 1/2 mil of wind and I knew this from hours and hours of shooting in all conditions and know what this bullet does in like conditions.
It was a one shot high shoulder kill.
