I'll chime in on primers. Not much difference between brands, use whatever works, is available, or is cheaper in your area. One thing to note is, once you work up a load, keep the same components. Don't change unless you work up the load again with the new components.
Best way to reload the cheapest is to buy in bulk. Hard to do at first, but if you buy powder in 8 pound jugs online, you get the very best price. Same with primers. Buy 5,000 in a case and the price is a lot lower. See if you can find a loading buddy locally to split orders and you will cut the hazmat charge on powder and primers in half.
Powder will vary according to what your reloading manuals recommend for a particular bullet weight and shape. Select the bullet first, then the powder for that bullet. Many times for handgun you may be able to use the same powder for several calibers. Rifle less so, but always use the manual recommendations. Start with a low load and carefully work up each load until you find what works best in YOUR firearm.
Oh yeah, NEVER trust any load that you find on the web until you have verified it with at least one manual. Believe about half of what you hear, and about one tenth of what you read on the net.
