When you are only matching charges and your velocity exceeds book values, it's because you are using the same thing as the book. It is possible that you have some tight tollerances, but not likely. The reasonable explaination is the different lots of powder(tested, Vs. what you use), when you burning speed is faster, you have higher pressures.
Don't think so on this.
Running 100 fps over hodgdon for benchmark at 1/2 grain under max. Running 40 fps over nosler for the same charge using benchmark.
25.5 grains BM
Norma Brass
52 grain SMK
CCI BR4
average over the Oheler is 3450 for 5 10 shot strings, 2 different lots through 2 rifles of the same manufacturer.
Don't think those components are what they used in the book
