TexasCHLforum.com

As noted you'll never get 24 long guns in a "24 gun safe" unless all you own is lever actions. Thus, always subtract about 1/3 of what the quoted capacity is to get to the real world holding capacity. So with that in mind the "always buy bigger than you need" mindset is sage advice. I would say buy as big as you can afford/fit in your home. You'll fill it up one way or another, and usually much sooner than you planned.