Lot's of ideas here about determining pressure... Loudness tells you nothing and in this case neither does velocity. You can have a slow load and still have excessive pressure if the powder burn rate is fast. Andy is on the right track, but I would rotate the gas valve to shut off the auto load and then manually cycle the action when you shoot. Pay close attention to the effort required to extract the fired case. Look for what bolt action shooters refer to as "stiff bolt lift". That is an indicator that tells you the pressure exceeded the elasticity of the brass so it does not spring back and becomes difficult to extract. If it is difficult to get the bolt to rotate, you have an overly hot load. If you are getting stiff bolt lift, then as Andy indicated, primer pockets will be stretched.
If you are not getting stiff bolt lift, then your pressures are probably OK, although looking at your primers, you are definitely on the hot side. On the other hand, the primers could just be very soft.
Even if your pressures are high, I wouldn't just junk the ammo. If you can afford a little extra length without jamming in the magazine, just extend the bullet seating depth maybe .020". That will increase the case volume and reduce your pressures.
Worst case scenario is pull the bullets and take a grain of powder out of each, then seat the bullet again.
One more place you might want to look is your barrel. If you have a lot of rounds through it without a real good cleaning, you could have some crud build up and/or heat checking in the throat. If this is the case, your pressures will rise as the bullet enters the rifling. The fix for this is to simply give your barrel a good cleaning, especially in the throat area. You could just use a bronze brush, or a trick some target shooters use is a patch of very fine scotch brite, maybe 1000 to 1500 grit. If you have a problem it will bite hard at first, but as you short stroke it through, it will smooth everything out, remove the crud and get easier to push. While 1000 grit is too fine to cause rifling damage I would not do this too often, maybe every 300-500 rounds. The trick with scotch brite is to start from the breach, never the muzzle.
