Totally depends upon caliber and load. Also this should be in the reloading forum. Anyway, there are 7,000 grains of powder per 1 pound.
So .308, middle of the road average about 45 grains each, 7000 divided 45 is 155 cartridges.
You move up to .300 Rem SA Ultra Mag you get about 105 cartridges.
You move down to .223 and you get about 280 cartridges.