My nosler manual lists 52 grains of imr4831 with 150/155 grain bullets and 50 grains of imr4350 with the 180s.That would seem to indicate that magnum primers are actually what the author is recommending for this situation in the article.
Except that the Nosler data is for the 210 primer.Substituting a 215 primer will increase chamber pressure.Nosler does not list pressures,so we don't know what the pressure is for the imr4350 loads.That might be safe for the 150gr bullets,but my Lyman manual lists the pressure for the 180gr load right around the SAAMI design pressure with the standard large rifle primer.Substituting a magnum primer,could cause pressure issues.
Stubble I thinkyou misunderstood my post based on the quote you pasted above. I was not referring to the primer burn time, I was referring to the cartridge burntime or powder burn rate.
The powder burn rate is fixed by the powder itself,not by the primer.Once the powder is ignited,it will burn at the designed rate.The magnum primer adds more heat,and therefore creates more pressure,it doesn't change the burn rate of the powder.