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That is exactly what I was talking about. I had used some VV N560 in a load for my .260 Rem. 20" barrel, and had a lot of muzzle blast. This powder may be good if the rifle had a longer barrel. So the bullet exit is probably up much higher on the burn curve since there is a lot of muzzle...

What would the burn curve of a powder load look like if it was plotted on a chart? And what point on that curve would be optimum for bullet exit of the barrel, in terms of velocity?