In the new Knight plug, yes. It fits the best and leaks the least. Fired primers come out nearly spotless in most cases. Other primers are shorter and normally have more blowby.
More blowby=less heat/flame/energy ect ect delivered to the powder.
I have nothing against mag primers. One of my custom builds was head spaced and the primer pocket machined for CCIs so that is what i use in it.
There is one small negative with using mag primers. They create more fouling in the flash channel. Its not really an issue in a hunting situation.
