+1 for Johnson. Also consider if your long guns have optics they take up additional space and need to be stored in the center away from the sides and back. If you have a long trap/skeet gun(s), depending on the configuration, you may need kick out the butt and take up extra space also (I don't like storing in 2 pieces).
If you have 10 long guns now, buy a safe that will hold at least 30-36, as other's have already said, they multiply year after year.
If you have 10 long guns now, buy a safe that will hold at least 30-36, as other's have already said, they multiply year after year.