You have to break it up to get the best return.
1 crate: let us say $30.
20 Bandoleers at $10 each = $200
200 stripper clips @ $4 each = $800
1000 rounds of .303 @ .75 a round = $750.
Total = $1780.
This is the system I use when guys are selling ammo in bandoleers and on strippers. Often, by the time I deduct the stripper clips, the ammo is just about free. When I get a table at a gun show, the stripper clips are a very steady seller. I'll resell the clips and the bandoleers...the ammo I always keep.