ERIN Digital & Phone net Tuesday May 7, 2024; Go Here for Current SOI
From what I have read magnum primers burn faster and light more powder faster. I can't speak to downloading your rounds on account of it.
There is alot of misinformation in the reloading realm. I don't want to add to it but I did notice that they recommend using magnum primers if you expect temps below 20... WTF??