1) Make sure the bore is clean
2) Make sure all all things are tight on the mounts,rings,action screws etc
3) Shoot from the same position using the same technique everytime all the time.
4) Select 1 load and stick with it, don't change this variable, resist the temptation
5) Practice, practice, practice!!! As you develop you will be able to out shoot your load/gun combination. Then start tweaking the variables one at a time and documenting the changes.
6) Don't get discouraged the starting point is 2.7 MOA, it's a learning curve thing. Enjoy the process.
This is good advice. What was the temperature during your shooting session? Anything over 80 with RL 19 can be problematic IME. I had an issue with it in 30-06 (same case) on a Florida hunt and was soured by it quite a while ago. Storing ammo in the sun can cause issues as well. Have you read any of MD's gun gack books? Lots of good info there.
The temperature sensitivity wont reveal itself without a chronograph
Good luck and shoot straight y'all.
