Jeff,
Your results with 65gr of 7828 are only about 75 fps behind my results with same and I have a 26" barrel which jives with the standard thought of 35-50 fps per inch of barrel. Also not sure it matters but my can of 7828 is about 20 years old, but I bought a lb of 7828ssc yesterday and plan to try it again tommorow working from 64gr -67gr in 1/2gr increments. Will also reshoot r26 from 66-68 in 1/2gr increments.

In my barrel both R26 and 7828 can get 3k fps without shcitt for pressure signs and great accuracy so now I'm just playing to play.