I do believe him when he says 500mg/ml will hurt, because it will... real bad too. Now if you look at it 1000mg is 1 gram of powder, that is what is in one 10ml vial of test prop 100mg, if you have 500mg/ml that is 5 grams of powder alone in that vial, you aren't going to get a lot of chems or oil in there so that is where the pip comes in, there is a high concentration of gear in very little oil and whatever oils and chems you do get to fit in that vial it isn't going to be enough to offset the pain it is going to deliver. So in saying that I believe that guys who say they have 400-500mg/ml gear with little to no pip are not being truthful, not that they are flat out lying but maybe there podwer isn't as pure as they think thus rendering the product less potent than though. We don't make any high mg/ml gear because we don't want to use any other chemicals in our products for a variety of reasons and because the pip would be worse than one would like.
Thanks
TMM