Most liquid is in the range of 90-200ug per drop, 200ug being rare
The stated loading tends to rise as it passes through hands more than anything else 8)
I have dosed many batches of liquid over the years and never heard of anything above 250ug/drop (2 drops of this was insane). I have been on the receiving end of people talking absolute bullshit "this liquid is 300-400ug/drop" and subsequent tongue testing disproved this.
Most tabs are in the range of 30-50ug, strong tabs in Australia hardly ever reaching 100ug. This is not what you will hear from dealers and most LSD enthusiasts though. Most people thinking their tabs are 70-150ug is probably the basis for such outlandish liquid loading statements "those tabs were 100+ug so this liquid must be 300ug, right?" 8)
3 drops of 150ug has me proper fuck eyed and many people are a babbling mess at well below that dose
I recommend halving most stated loadings as this would be much closer to the truth IMHO
You only have to read what effects orange sunshine (300ug per dose) had on people to realize that doses are way over exaggerated now days.
250ug is an amazing dose and I see no point to any liquid that is above this per drop as it makes dosing a chore
Liquid in the range of 100ug is perfect for easy dosage calibration and this is what you are most likely to come across