Not sure of your exact requirements of your current project. Whether it's hunting, bench, tactical rifle or what you are really trying to build and what your actual goals are with it.
This is one of those projects where you can spend a little or a lot depending on what you want.
If you're going to shoot long range, you need at least two different additional items, a good Chronograph and ballistic program. These two items can make your life much simpler.
I would recommend the RSI Shooting Lab ballistic software and the CED millennium Chronograph. A third item for the extremely serious long distance shooter pressure trace software. I'm not that die-hard yet.
I've attached the link to the RSI shooting software for you to browse. But do yourself a favor first and call Jim Ristow at RSI on his toll free number. This mans knowledge is unreal. Jim got me started in ballistics’ about 10 years ago. He understands this stuff better than anyone I've ever talked with. When I get stuck on a problem and I can't figure it out, Jim gets me through it. Mind you, he's sharp and sometimes I have to real him in and get him to talk in language I can understand.
I use two of his CED chronographs though he tells me how unnecessary it is. He actually tried to talk me out of my second unit. But, I've chronograph my loads at the muzzel and out to 700 yards using the two units. With his ballistic program I know exactly what my load will do out to a 1000 yards.
After I had my muzzel, 100, 200, 300-yard average velocities, I was able to work with his RSI ballistic lab and it predicted my 4,5,6 and 700 yard velocities dead on +- 2 fps. that was the farthest I could shoot and not worry about shooting the bullet sensors on the chronograph. At 1000 yards I was right on, even when the atmospheric contitions changed and temps were rising to over a 100 degrees like we get here in TX. I changed atmospheric conditions on the program and the RSI programmed tracked exactly.
If you want to email me with your number, I'll be glad to give you a call and we can talk.
Best of luck.
JeffRSI Shooting Lab web site