Try this site:
http://www.jbmballistics.com/cgi-bin/jbmtraj-5.1.cgi
I have found it to be very close. I used it when I started long range shooting. I had a 100 yard range to sight in and needed to know where to set my scope for 600 yds and eventually 1000 yds. In both cases when I shot I was on the target and only had to make minor adjustments to be dead on.
Looking quickly at your rifles they both drop about 3.2" so you are closer to 3" than you can hold the rifle.
I assumed a 3000 fps velocity which should be close for both your rifles. If you have a chronograph you can put in your actual numbers. The bullet library is pretty extensive. When you select your bullet it will use the library data for the calculations. You don't need to fill in the BC, caliber, or bullet weight.
My bullet drop at 1000 yds is about 274 inches, almost 23 feet.