The same holds true with the .44 mag and .45 Colt, LP mag primers are not as good as standard primers. Even Federal is loading mag loads with the 150 primer.
I do not go to the LP mag until the .475 and up.
Not sure what you mean by "good". According to my chronograph, mag primers greatly reduce the Extreme Spread when using H110, W296, Enforcer and LilGun in 44 mag. I take the lower ES to mean that ignition and combustion are more consistent.
