There is a lot to be said for dry firing, for both rifle and pistol shooters.
Dry firing allows you to become intimate with your firearm. It forces you to concentrate on the two most important of the shooting fundamentals, aiming and trigger control. And using your firearm, it costs absolutely nothing to train this way.
I believe there are few things you can do that will improve your trigger control dry fire. When at the range, the “Ball and Dummy” technique can help you see issues that can be holding you back from shooting those small groups.
Loaded in with live rounds, dummy rounds add the element of unknown in a string of fire. It forces you to focus on the sight picture and the “surprise trigger break”. Invest in some dummy rounds today, and start dry firing tomorrow.