It's really hard to judge what you should take from those tables. Always start small. I think they are talking about pure diamorphine doses.
I have what I'd say a medium going on heavy tolerance. I use 200 to 300mg heroin a day, or a couple hundred milligrams of oxy a day.
My common heroin dose is 30 to 40mg, and I have great raw. I wouldn't even take those strong doses for someone with a heavy tolerance - 150mg might be and OD risk for me. Well - it would definitely make me nod, and that's not what I'm looking for out of opiates. I like the energy, initiative, motivation, pain relief, antipsychotic, antidepressant, anxiolytic, euphoric, physically relaxing and mentally stimulating effects of the lower doses that do not impact my mental faculties at all or make me drowsy in any way (probably because I am so high strung to begin with.)
I've had really really pure stuff over the past 5 years on occasion and honesty with little to no tolerance, twenty milligrams might have killed me from that china white. Fuck do I miss that stuff though,
It's just impossible to say, every batch is different. I'm lucky enough my supplier has had the exact same quality stuff for the past 6 months. You have to learn the potency of the batch by starting with very small amounts. Start with 5 or 10 milligrams - and wait 15 minutes - like seriously time 15 minutes because the effects build up when you sniff! Peak at around 15 min.
This is my experience. The one time I got real SEA china white heroin (not fentanyl) it was mind blowing strong like I couldn't fucking believe it. Match stick size bumps were getting me going good. I use afghan #4 these days with a strong vinegar smell, and after 5 years 30mg will still get me high insufflated. Be careful!
This is just my opinion based on 5 years of chronic heroin use so take it with a grain of salt. By the way, I have directly thrown over 50% of new suppliers heroin in the garbage (well, disposing of it properly all sealed up) because, in my opinion, the fucking garbage didn't even contain diacetylmorphine at all, or very little of it, and other very dangerous unknown chemicals. You have to be careful these days, people are passing off fucking filth as heroin and it's somehow working. I'm glad I got a good connect for that nice afghan #4 these past several months. It has been wonderful. Just seriously start low and make sure the hits are consistent. Like, make sure every time you dose 20mg you get the same high. So that there are no hot spots.
Again, this is just my experience so I'd honestly say start by weighing out 10mg, sniffing half of it after breaking it into two piles, timing 15 minutes on your phone or whatever, and if you feel good do the other half. Just my advice. You really want to take it slow and be safe at first with ANY new batch, even long term users do this so please be careful it's your life!!!