Just food for thought.
Many of the above are very good and folks will cover the paper topic, but I will throw in the idea of ShotMarker (eTarget) since it hasn't come up yet.
With a SM or SilverMountain, you get an image of the target, it does the group stats in real time if you want them, it gives the velocity at the target, and it also puts the data in a CSV file for you.
Once I got a taste of working with electronic targets at work, decades before the ShotMarker or SilverMountain came out, it wasn't affordable for me to own a personal eTarget so when those came out I jumped on them. I was involved at two clubs with Beta testing them since I had industrial experience with the predecessors (all of which cost factors more).
Since I got a personal ShotMarker unit, I only pull out paper for subsonic stuff like rimfire or pistols since they won't register. The projectile must make a sonic shock wave to register with one of these inexpensive systems.
I realize paper is way cheaper, but once you find yourself out past a few hundred yards, or trying to practice for matches by yourself, you won't look back on what these cost. YMMV