Question on ballistic app data inputs

[LRRPF52]

When I've chronographed factory 123 grain A-Max it averaged 2464 FPS out of a Brownell's 18" Grendel II chamber (Satern/Liberty barrel) 1:8 twist on a 70 degree day. The Hornady 123 grain SST Factory averaged 2490 the same day with Magneto Speed Chronograph.

Here is a picture of the velocity curve LRRPF52 has posted from the Grendel handbooks.

That's right where most 18" have chrono'd for me as well with that load and conditions.

Usually in the high 2400s-low 2500s with a factory Hornady 123gr, and low 2500s with an AA 123gr Scenar load.

There are a bunch of threads with scores of chrono samples already that I've posted across many different 18" barrels that I personally did, along with posts from others with their 18" data as well.