Wolf made or makes three sr primers. The copper colored ones, silver colored ones, only difference is cup is harder on silver colored one. Both have same amount of primer material. The other one is which is silver colored but has more primer material in it. I think it's consider a magnum primer.
I have had the identically results when I comparted the Wolf SR copper colored cup with the CCI 450 which is considered a magnum primer.
There are not standards when comparing primers.