Iwas looking through their catalog on their shotguns in reference to the pardner and the h&r topper. It says that these shotguns have up to a 3" chamber does this mean that it can hold shells up to that size or does that mean that they have models with different shell sizes?

It means that its chambered forammo up to 3" long.

NEF....New England Firearms good quality and lower prices...like savage company..... Alot of folk will say its junk but some still say that about savage......I say if its good stuff and cheap....IM in...JUST purchased a smooth bore 12 gauge pump,..shoots everything but magnums and sabots...at Gander Mtn. for $139....Lets see Remington or Browning or Wincheste do that...They could ..but they already have us used to paying out the nose....why would they give a deal like that now!!!!!
Pardner also has a slug gun rifled barrel for $169 at Gander

Strut is correct in his info!!!!23/4 inch and 3 inch shells are in all brands and types

A gun that has a 3" chamber stamped on it or advertized with it means it will shoot a 2 3/4" shotgun shell or a 3" shotgun shell. It will shoot either one!! Vangunsmith

Only thing, is with a rifle NEF you have to buy factory ammo or full length re-size due to the gun having a tight chamber. You must not use dirty ammo, it will get jammed in the chamber. Other than that, awesome! Killer accureacy. EJ