if you are willing to "pay for it" then what is your budget? what is your "weight limit" do you reload or do you want to only shoot factory ammo? sounds like you want to reload and shoot some 180s (which is a good idea). i would look in the classifieds and pick up a rifle with a dbm. with a 5 round mag, they don't hang out too far. with that there will be lots more choices than going with a flush factory mag. or even get a nice rifle with a std hing floorplate and then put some bottom metal on it later