Magnum vs Grand

[golfer]

Has anyone who built a load with magnum tested data of that load vs Grand? After searching google they show they are next to each other on the burn chart. Are they interchangeable like people claim rl26 and n560 are?

 

[std7mag]

Has anyone who built a load with magnum tested data of that load vs Grand? After searching google they show they are next to each other on the burn chart. Are they interchangeable like people claim rl26 and n560 are?

Guessing Magnum reacts more like RL23 from what I've heard.

Grand is supposed to replicate H1000.

I'm doing fairly well with LRT.
Takes a heavier load than other powders that I've tried.
The 257 WBY loves it!!