Here's the pic so everyone can see without going to the link...



What you've got there likely started out as a mid to late 00's package gun. That would explain the round-top action and standard trigger as Savage didn't put the AccuTrigger on certain package guns for several years after it's introduction. As for the loading port being elongated, that's not factory and as olddav said its likely someone opened it up to be able to eject a longer loaded round.