Just posting this for an example of what changing lots of the same powder can do. I had an old lot of n570 in sealed cans. 63gr of the old lot was pushing a 147 eld to 3122fps in a 6.5saum. The new lot only yeilded 3051 for the same 63gr charge. I had to run 64.5gr of the new lot to get back to the same speed. The old lot was made in 2015. The new was made in 2019. I was expecting some difference but not that much.
Last edited:
