Even though this is an old thread, I have renewed interest in the Thunderbolt.
The wife and I shoot 22N, currently stuck @ 600 yds, in 28" ARs.
I size 6mm Hagar to 22 Nosgar for her, and 22 Nosler/Dogtown brass in a No-Gas AR for me.
Still have over a thousand untouched Hagar cases.
Neither of us shoots tiny little groups but getting better.
If she keeps her interest up, a Thunderbolt bolt gun might be a good Christmas (or Valentine's) present.
She doesn't read here
Staball 6.5 is fast in the 22N, 31.0gr under a 90 A-tip in the Nosgar, 32gr in the Dogtown brass moving real close to 3000fps (2050 or so @ 600).
SB 6.5 would probably work in the TB.
I've got about 3300 rounds down the No-Gas barrel and it's about shot out. She has about 700 rounds on hers.
How's a Defiance action, with a .224 bolt face, and a button X-Caliber barrel (29" bull 1:7) sound?
Guess I would need to have it chambered for long loading the 220 TB.
Time to learn, search, and shop.