OzarkPA you need to get a loading jag for the Barnes bullets. That ramrod end has female threads and will accept the loading jag. Then it will not damage the bullets. You will probably see an increase in accuracy. If you can't find the Barnes head, the T/C Shockwave head works fine and it acts as a clean jag as well.

Also you need a short starter. Since your shooting sabots, get a T handle short starter and remember, that needs a loading jag as well.

Like Breechplug said, it sounds like your in the ball park for those distances. But do get to a range and try the rifle at the distances you think you will be shooting at.