The amount of powder required will depend on the charge that you use. If your purpose is to duplicate factory 230 grain FMJ ball, that is one charge weight, and if your purpose is to approximate factory ball using a 230 grain lead bullet, that is another charge weight. The charge weight will also depend on the powder you choose.
An example will help you decide: 5.0 grains Bullseye or 5.0 grains WW 231 behind the 230 grain cast lead RN bullet will approximate the factory ball load. That will require one pound (7,000 grains) of powder.
6.5 grains Unique behind the 230 grain FMJ ball bullet will duplicate the factory ball load. That will require 6,500 grains of powder.
To give you round numbers, ONE pound of powder of your choice will load the 1,000 rounds you want.
In today's current reloading components and ammo climate, if you find needed components at good prices, it's probably a good idea to stock up. I was at the Reno Antique Gun show last week, and the ammunition stands had lines 150 YARDS long. Many buyers were rolling around hand trucks for their purchases. They were the only ones doing brisk business.