Dont think you would get a perfect 50/50 ratio per ml either. Would be guessing whats in ur 1ml everytime. Thats why they come in seperate vials. U could draw up .5ml from one vial and .5ml from another and get a perfect 50/50 ratio. Some gear is "Made" into combos at an accurate dose but i dont believe in putting 10ml of one compound into another vial that already has 10ml of another compound and thinking everytime u draw up 1ml ur gonna get a 50/50 ratio each time. DOnt think it works like that.