I have never had to use a magnum primer. It is not a .50 BMG powder and would be very dangerous to use it as such.
Any load over 75 grains in my magnum rifles really changes how it burns.
But in cases from .223 to .300 Win Mag, the powder has worked very well for me. It is close to IMR-4350, just slightly slower, Not 7828 slow.
In cases up to .30-06 and 7.62x54R, a load up to the shoulder of the case is just about right. You can go more but it is really not needed. Just never tightly compress the powder. It will spike like mad if too compressed.
I have many,many loads that work well.