As said, many shotshell powders will do well in pistol loads, but full power military rifle ammunition calls for something much slower burning.
Read up. The ABCs of Handloading, a metallics manual, and a shotshell manual will be useful. The free literature from the powder companies shows both metallic and shotshell data and you can use it to pick a powder that will serve handgun and shotgun.
Don't buy a "good amount" of powder to start with. A pound will load a lot of non-magnum pistol ammo and a fair supply of shotshells.
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