I just got 2 lbs of N-570 from Powder Valley and all I can say is this is the worst handling powder I've ever dealt with. The kernels are too LARGE. I'm a big Vihtavuori fan (it's always been the most consistent from day to day for me), but I'm a little disappointed in the size of the kernels. Is there a reason for the extremely large kernels. I've been shooting Retumbo with good results, but the day to day #'s are the reason I tried N-570. One day with Retumbo, I'll get around 2875 fps for an average and the next (similar temps.), I'll get around 2825 or less. Retumbo, so far seems to give about 50-75 fps better speed with similar pressures.