I've had that happen. It's picky with ammo you will notice it will never do that with certain ones. To get it unjamed I tapped the projectile back into the mag with a cleaning rod from inside barrel wiggle to mag to line it up if needed. Empty the pellets front the mag and try 34 grain FX...
Shipped together bubble wrapped $50 Barska 3-9 hammers 4-12 (no dial caps ) mill dot Rectical good used condition ,sticky tape marks where they were mounted
Super Loud pop. Quite effective but overkill thought I'd see what the .35 hybrids at 1000 fps would do. ussually using a .22 avenger much safer shooting at birds. But with plenty of woods and proper angle it was a must try.