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You should be able to use StaBall to drive a 130-143gr bullet to at least the same velocity as you get with 2209. So yes it's a viable backup option in that sense.

It might not be 42gr that does...

That's a bit of a weirdly phrased question. Can you explain why it should matter?

If you want to try it, go get some. Look up the load data from Hodgdon (that will give you an idea of what kinda...