Welcome to the 'fire.
I also found Load data in manuals is a 'little' anemic and greatly varied for the 7mm rem mag. Chronograph some factory ammo.... most stuff will not be as stated.
Agreed with bob, no chrono your kinda in the dark. I recommend using one highly.
In the heavier weight bullets in my 7mm rem mag, my findings have been spot-on with dogshooters said velocity, but with 'rogue' charges compared to most manual. Other than limited loads with some 150 grainers, I have not done much work with 160 gr. and below.
