Re: Need Help Finding 10ga 00 buck shells
those appear to all be 12 gauge rounds, carver.
I personally have not seen any 10 gauge 00/000 for many moons, and it was at a gunshow in the 'collectors ammo' booths. The slugs on the other hand I've seen more recently, but I cannot recall where it was or I'd go check em out to see what the price would be.
I'd guess the best way would be to have someone reload them for you if you know anyone who does that, or could do it yourself.