Grimstod
Machinist, Designer, and Shooter.

Left to right.
1. BRX fire formed
2. BRX same gun FL sized with a custom bench rest quality die matched for the chamber.
3. 6.5x47 Fire formed in a gun someone else built.
4. 6.5x47 One I built and headspaced. Fire formed.
5. 6.5x47 out of the box from Lapua.
6. 7.62x54r Fire formed in a gun I did. Headspaced as tight as possible.
7. 7.62x54r out of the box from Lapua. 2gr difference capacity!
With differences like this alone, not to mention how the barrel copes with the bullet it no wonder then that your rifle may like a different load, and especially have a totally different MAX load.
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