If it helps, I just sold out of late 80's Albanian, a total of 10 440rnd cans, sold as seperate 20rnd packets at $5.00 per packet.
It took me 6 or 8 shows to sell it all BUT at the last two shows, guys showed up and bought all I had out for sale at $5.00 per 20rnd.
The larger ammo seller/s have been pricing 20rnd packets of 54R at better than $7.00, so I think you could move 20rnd packs for $5.00 or $6.00 at a decent pace.
Drop it to $4.00 and it should fly off your table, maybe even to other vendors tables where it will get bumped and resold...