I just shot my K31 at 600 yds at Nashua. This was my first time ever shooting beyond 200 yds, (honest). I put 16 rounds downrange, basically just to see if I could get on paper without embarrassing myself. (This was prone, off sandbags, with a Bushnell 3200 Elite 10X Mildot scope.) Using a .308 Win chart to estimate how many clicks I needed to get up from the 100 yard zero I had, I got lucky. My first shot was a 7, perfect elevation, off at 3 o'clock. Five clicks left and my second shot was a 10. It took me a few shots of wierd inconsistent hits to realize my scope bases were loose (I never torqued them because I thought I might need to adjust eye-relief... duh). After a few more shots (and re-tuning) I ended with 3-10's and an X. I was no doubt grinning like an idiot. Can't wait until Thursday morning when I can take my time, and work on my end of the deal. The K31 can obviously hold up its end! Now... is Reading the only place around that has 3x600 shoots?