Old Stevens model 330 chamber length?

[Paul Trout]

Hey fellas, so I'm thinking about picking up this old 20 gauge shotgun but the seller doesn't know what length shell it takes. I'd like to shoot birds with it so am hoping it's the common 2.75". Can anybody tell me from experience? I believe it's a Steven's model 330 with 26" barrels if that helps. I'm trying to save myself a trip across town to see it in person if it's not chambered in something common. Thanks a lot in advance!!