Powder Help Please

[USSR]

Of the powders that are in stock I found two that may fit the bill, it is IMR 4064 and AA2520.
Since I need a powder for the long hall I am uncertain which of two would be the best choice.

Depends upon whether you intend to weigh your charges or just drop them from a powder measure. With the long grains of IMR4064, it will not work well in a powder measure, and it is best to weigh your charges. AA2520, on the other hand, is a ball powder and works really well in a powder measure.

Don