For plinker loads I like these,
http://www.midwayusa.com/product/73...caliber-512-diameter-240-grain-box-of-50

Loose powder would allow you to tune the load up or down as needed...


"Camping places fix themselves in your mind as if you had spent long periods of your life in them.
You will remember a curve of your wagon track in the grass of the plain like the features of a friend."
Isak Dinesen