Free: Contests & Raffles.
Expect about 2/3 stated long gun capacity, especially if ARs are in the mix. I'd go with a mix of smaller safes for more flexibility. You can always buy another safe.
I wouldn't trust a 30 min fire rated safe with important docs... They will burn up in a house fire.
I would check out the liberty safe dealer in eatumclaw. They seem to have the options dialed