I personally wouldn't inject more than 300mg of Primobolan at once, because I know it will give me a hard time but we're all different. Somewhat surprised to hear there are people who can easily get away with 400mg at once, bravo
If you run into any issues regarding injection pain, I recommend warming up the gear before injecting as I have experienced this to be one of the most useful techniques regarding the issue.
On a personal note, I happen to disagree with the statement that Primobolan is a weak compound by nature. This is a conclusion most users leap to without really considering the fact that it simply is a compound effective at a higher dose range, and thus shouldn't be compared to other compounds on a mg basis, such as Tren or Anadrol, since every AAS can be vastly different from another. For instance, both Fentanyl and Morphine are opioid analgesics widely used in the medical field; however, Fentanyl is approximately 100 times more potent than Morphine. Now does this make Morphine any less useful or less effective than Fentanyl by any means? Of course not. Nonetheless, therapeutic dosage of each compound can be vastly different and often is, which is why a mg basis comparison is neither just nor rational IMHO. I have used pharm grade Primobolan Depot at 750mg EW in the past and attained very good results, but again, I am not nearly as big as Marcus so the very term ''good results'' itself happens to be relative...