On 3 of these groups, I rotated the can, so you can see how point of impact shift occurs. So you want to make sure your Suppressor is "locked" in place, and doesn't spin when your shooting with it.
Accuracy is bi-product of this test. We want to find and understand which powder burns CLEANER, so it doesn't cloud up your red dot and bombard your face with particles of powder.
Scroll down to bottom to see Graphic for cleanest, to dirtiest.
1= BEST. No debri whatsoever, zero, zero particles, zero clouding from residue on red dot.
10= Very dirty, waves of particles hitting your face, and making red dot cloud and get dirty making it harder to see out of it.
Now the concept I believe in, is in a general sense, these 2 guidelines, that are not absolute...but generally..
1) Less powder charge from a faster powder, generally will more fully burn and not produce as much blowback as double the powder and a slower powder.
2) Using Magnum primers helps more thoroughly burn the powder. After all, isn't this why people recommend Magnum for larger powder charges, because it more completely burns it? Exactly...same thing here, it can't hurt.
However, Manufacturers do NOT recommend you use Magnum Primers in non Magnum cartridges, so I DO NOT RECOMMEND IT. After all, if you use a Magnum Primer, it will require "less" powder for same outcome than non magnum primer, and it varies. So its not recommended!