Go with the 223 for sure. As mentioned, shooting is shooting, it doesn't have to be 1000 plus to work on skills, reading wind, and working on running solutions for hits.
I switched to my 204 while I work up loads for a new 6.5-284 that I just acquired. The 204 give me fits sometimes past 600 yards. If mis-read the wind, I am screwed.
Here is an example of a shooting the 204 with slight variations in wind in the first vid, and the second is a cold bore shot after load work up to verify velocity etc. My point is, just get out and shoot.