nobody,
When I first started out in rimfire Br I asked a lot of questions. I got answers to some and no answers to others. Like you I thought maybe they were holdng out on me. As I learned morte I realized I was asking questions there was no definitive answer for. I found the rimfire shooters to be an honest group of folks, and if they didn't a have a definitive answer they didn't amke something up. I see a lot advice from new shooters to other new shooters on teh internet that's pure crap. If you get advice, check the credentials from which it came. That's the best advice I could give you.
Now on tuning, I could tell you to turn your tuner to where mine is set (211). Last week I shot a 30 bull practice IR5050 target and shot 30 tens and 27X's outdoors with light wind, so I'd guess it's pretty close, or that was some real good ammo. But, this is a fluted .850 barrel 23.75 inches long. My info probably wouldn't be of much help. I used about a half a box of cartridges tuning it so it's probably not perfect. I think I'll leave it as is though.