I use a Really Right Stuff TA-2U -LB leveling base. Much prefer it to the ball heads I have owned. I use it for optics, range finder, and my rifle. I find it more stable than a ball head as it's not fighting gravity as much when not in fixed tension. You get a little less angle with a leveling base but this can easily be compensated for by adjusting your tripod legs a bit. Rarely if ever need to do though. I have used this setup dozens of times over the last few years or so and am very happy with it.