Look up the heat index for AA2700, very, very cool burning.
4064 is rough on barrels compared to 2700, 760,380, or 414.
I burned out 4 swift barrels with 4064 before a gunsmith in San Diego told me about 2700. 2700 also works with 55 and 63g bullets as it has the burning rate of approximately 4350.
I burned the barrel out of a 22/250 shooting 35g of 4064 in one day on a p. dog town, Shilen barrel....that hurt!
