Fallout 3: Have assualt rifle ammo but cannot use it. Why?!

I was just wondering if i should head back over to the boat and back to washington DC, ive done a few quests over here in point lookout and have enough money and good guns now, but i dont want to b missing out on a big chunk of the game, i think im level 10 now is it worth me going back over?
 
I think I played through the whole gaming using mostly a hunting rifle lol. Once you get the power armour there isn't much left of the main quest :/
 
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