Reloading isn't a guarantee that your ammunition will be any better than factory loads, and even those who shoot well will often tell you they're not an expert shot. We all blow it from time to time.

What mounts are on these rifles? Were they torqued to spec? Loc-Tite'ed? I've seen cheap and poorly installed mounts wreck the accuracy of many a fine rifle.

If you're getting 2-3" groups off a sled, I'd be looking at mounting issues first.