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Look at the charge weights/costs for different powders. I would also seriously consider looking at the margin between starting and max loads and try to get something with a little elbow room.
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2230 appeared to be a "middle of the road" powder providing a wide margin between minimum and maximum as well as being reasonably priced.
With these initial loads I'm using LC 06 brass, and I'm trying out FC cases with both crimped and uncrimped primer pockets. With the FC, I've noticed that the uncrimped cases are considerably heavier than the crimped ones, so I’m loading these as though they’re different cases, which they are. I know many of you think they’re inferior cases, but I have a boatload of them, so I’m going to try and live with it.
Powder loads are 1gr. below minimum, worked up to 1gr. below maximum, in .3gr. intervals consisting of ten rounds per charge weight. I thought this would be fairly safe considering some brass has less capacity than others. Primers are CCI 400.