4 years have seen a lot of change in the .22 LR market....
I won't touch Thunderbolts with a 10 foot pole, now.
Remington cut too many corners, and lowered their quality standards too far. Bulk pack, or not... Golden Bullets, Thunderbolts, Cyclones, etc. are all crap now. (And Federal isn't much better.)
The only Remington .22 LR I currently shoot, are some tins of Golden Bullets from 1977. They are consistent, reliable, and accurate. ...a world away from what Remington is currently churning out.