There can be a spread over 1ftlb between the least and most efficient pellet in your rifle.
When we were FT shooting every week or so and our rifles went over the chrono, every rifle was as close to limit as possible without going over. My 7.9 premiers used to run just over 800fps.
We had two Police officers in our club at the time and one was a Firearms officer, and they both used to do the same.
This not opinion, but fact.