I think alot of bros get confused how to MEASURE!!!!!!! LOL, I hear alot of guys talk about underfilled vials and most of you are probably correct BUT I cannot tell you how many times I have had people tell me where they pull to on the STOPPER part of the syringe, and line it up with the HASH mark on the syringe you are aiming for by pulling the POINT of the stopper (You know that little TIP on the stopper part?) that tip or POINT is what ALOT of bros "THINK" is where you pull the syringe to line up with the hash you desire!!! But this is INCORRECT!!!!!! That is OVER a cc!!!! Meaning you will MOST definately be SHORT in the end!!!
SECOND!!! Yes, going over by even just a LITTLE over the course of 10-15 pins will make the difference in 1-2 cc!!!!! The point of the stopper or that little TIP of the BLACK stopper is NOT where you measure to!!! Follow that POINT down until it comes to the actual BASE CIRCLE of the black stopper and this is the measuring line you line up with your hash mark!!!
Secondly, take a Terumo syringe 10ml and then an excel 10ml and suck up to 10ml in the terumo then squirt it out and suck it up with the Excel.............. Hmmmmmmmm strange that there is a .5 cc difference JUST in the difference between TWO notorious brands!!!! Now go to your local CO OP where alot of UNDEREDUCATED bros attempt to obtain their syringes (Which is HORRIBLE animal grade and sucks) now suck up that 10ml in that SHITTY cheap animal syringe......... LOL, 1.7 cc difference!!!!
So honestly!!! There is not alot of validity to someone just simply saying their shit is underfilled!!!
In the end there is always those labs that as stated ACTUALLY intentionally underfill their vials!!! But alot of times it is user error!!!
Lastly, I have never out of 3 different pharm grade brands I have used to include Sandoz and LOL, I would NEVER trade my UGL for that UNDERDOSED yet slightly overfilled HIGHLY EXPENSIVE without insurance that will cover it which mine doesn't!!!!! To damn EXPENSIVE for that SUPPOSED 2 cc extra!!!!! DOUBLE the cost of what I pay for my shit and contrary to your situation my vials when measured in whole always come out to over 10cc with my regular terumo syringes!!!