There's a longer answer to this. I'm not sure if it's interesting, so skip it if it bores you.
I've been thinking about LodeRunner's comment on
https://brushbeater.org/2017/11/26/practical-carbine-accuracy-off-the-bench-and-in-the-field/; the short quote is that to be a sniper you must first be a rifleman. Not just read a lot of books, and think about it a great deal over the past few years, but to be able to put good theory into actionable practice. I like the *idea* of being a sniper, but I'm not really a rifleman yet. I've chosen Appleseed as my next big step in fixing that. It's not tacti-cool, it's not run and gun, just basic riflemanship and weapon handling. (And great history!) That means Standing, Sitting/Kneeling, and Prone shooting with just a sling.
After that, we'll see what options are available. But right now I need to really focus on the basics.