Which powder to purchase

Yes, you could use black powder in all three cartridges.

HOWEVER, I'm not sure that I would want to try to load jacketed bullets in any of them. The .308, maybe (given that the British used jacketed bullets and black powder in their first iteration of the .303 British), but the two handgun rounds might present problems.

The cases simply might not be able to hold enough black powder to get a jacketed bullet down the bore. You might end up with a stuck bullet.

And, using black powder in a semi-auto handgun would probably result in having to cycle it by hand.
 
It's not a matter of what powder to buy. It's a matter of sequence. Buy a good book on reloading first. Learn the overall concept before buying anything. The time to buy powder is when you are have learned enough and are ready to start loading. It's like buying a case of motor oil and a filter because your thinking about getting a driver's license and buying a car.
 
H4895 is one of the most versatile rifle powders, and Unique one the most versatile handgun powders. But once you start loading you won't want to limit yourself; while both of those are very versatile they are not always the best choice for many applications. Unique will work for shotgun ammo as well - mainly heavier hunting loads though.

Personally I wouldn't suggest buying any powder until you are ready to start loading though...yes some powders were tough to find during the shortage but that didn't last forever and powder does have a shelf life.
 
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