This is spot on. I work up the load that's most accurate in MY rifle, using assorted powder, bullet, and seating depth combos. When I hit the one that shoots 1/2" (usually less), I'll chrono it for purposes of drop and windage charts. The FPS is what it is.
I ended up with Berger 80gr VLD's over Varget, with the OAL just kissing the lands. That has given me a best 5 shot group of .210" @ 100 yds. After all that, I used a chrono to see 3050fps. Now I know my 600 yard drop and can calculate for the wind.
The best you can do to have good numbers on a chrono is to be consistent in your loading procedures.
Consistent brass prep, charge weight, seating depth and neck tension are all I ever worry about.
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