Too many ... lol. First was probably a .22 LR90 but shortly after ... a Theoben R17. Wife and I could only shoot at 32 yds at the time but competed w each other as prep for FT. With the R17, a flier took me out of the zeros (less than .1") Her LR90 was very close.
Probably least I've ever done on one to be ready to compete was one of the first 5 DS Crx ST. Still have it. Amazing, durable, very shootable FT rifle. Mac1 Usft is right there with it but had to find a better barrel for it, so doesn't really qualify. Have to say the 2 steadiest, sturdiest, amazing rifles I've owned are the USFT and the Theoben R17 Mk1. Nearly 20 years now and still haven't replaced a seal on the Usft and the R17 went 17 years before needing seals .
The most accurate rifle I think I've ever shot , out of the box is a DS Midnight Wolf 22 HP I've been tasked w tuning. Straight from the box, pellet on pellet at 100 w moa groups..... mostly, depending on my wind judgment . Ridiculously easy to shoot. 980 w 25.4s on MID... crazy!
Bob