Mag pro can do it but not unusual for the WSMs to not reach advertised velocity as they are at 65,000 psi, no room for more pressure.
I have had factory ammo produce flat and slightly cratered primers. I know it is not an accurate indication of pressure and may be more a head space and firing pin hole issue but either way I am not used to it as a regular condition.
R17 may do it but haven't tried. Got an easy 3200 fps with R25 and 140 grain bullets and stopped there.
"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli
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