I used to shoot the Remington Thunderbolts by the brick (10 box of 50 rds in a box, not the B.S. some refer to as bricks) back in the 90s when Atwoods would sell em for $8.00. My only complaint is the black thumb from loading those magazines over and over again. (Bullet coating would wear off onto fingers during handling)
Wondered if Thunderbolts had still had that "wax" coating. It'd gum up my P-22 if you let the barrel get hot.