Keith Bulluck says his curling team -- comprised of ex-NFL stars -- is grinding like crazy on the ice ... and they're still dead set on making the 2022 Winter Olympics.
The squad? All-Pro Curling with Bulluck, Jared Allen, Marc Bulger, and Michael Roos -- 4 badass ex-football players with 9 All-Pro selections between 'em -- but ZERO pro curling experience.
Allen previously told us the goal was to rep the U.S. at the 2022 Winter Olympics in Beijing ... but that was before the team went up against real deal competition.