Loading bullets that are .002 under sized in likely to cause severe leading issues.
There's no way to tell you how many grains of "powder" should be used. All powders are different and there are literally dozens of choices.
I will assume that you are new to reloading and suggest that you buy and read "The ABCs of Reloading" and at least one good load manual. The Lyman 48th Edition is a good choice.
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Nobody plans to screw up their lives...
...they just don't plan not to.
-Andy Stanley
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