Smallest pin you've used successfully?

Over the past decade we have seen labs come and gone, and in that time we have also seen a slew of new recipes come out using thinner and thinner oils. My question for you guys is what is the smallest gauge needle you have used for a cycle before (NOT INCLUDING TNE). Really wondering if I should try either a 30G 3/4", 27G 1/2" or stick to my usual 25G 1". Please list the gauge and what you were injecting as well.

i've never been able to use anything less than 25G for oils.