I suppose that if 50mg/mL is a good concentration, that Shulgin's dose range of 5-30mg for IV isn't spot on?
No, that dose range is right on the mark. I used a 1/2 cc insulin needle, so that's 25 mg max per shot, which is as high as I've gone (and as high as I recommend going). See previous posts on page two of this thread for details. Also, here's another description I posted in response to Psood0nym's excellent trip report on the IV DMT/K combination.
http://www.bluelight.ru/vb/showthread.php?t=381963
I'm still very much under the influence and also very much in awe of the capability of this combo to transmute to my fragile consciousness into such sublimity. I literally felt as if I were tumbling through life's wardrobe. At one point I relived a childhood memory, playing in a ravine with my brother, only to realize I was being buried beneath and integrated into a great oak tree. My experience morphed through thousands of memories and textures, each exquisitely vivid and achingly beautiful.
I have tried many, but the IV DMT/ket combo is absolutely unparalleled.
Drug regimen
50 mg IM Ketamine
IV #1: 12 mg DMT/5 mg Ket
IV #2: 20 mg DMT/8 mg Ket
IV #3: 20 mg DMT/8 mg Ket
IV #4: 25 mg DMT/10 mg Ket
Each shot was spaced roughly 20 minutes apart, and each time my mind returned to a recognizable brand of consciousness at roughly T+0:10. Within ten seconds of depressing the plunger, I was forced to lie back, thereby ducking into a realm of expanding and collapsing corridors of the most brilliantly elaborate architecture. I was reminded of a particular
Escher print, bearing the impossible perspectives of each mental frame. Each moment carried its own signature associations, whether it was recognition of a long-forgotten smell or a familiar word carving itself out of the enigmatic, putty-like walls of my mind. I was twisted and ground through razor-sharp gears, slicing me into a thousand pieces, only to be integrated and reformed a thousand times more. Chutes and impossible tunnels whisked me through the endless cerebral labyrinth. At times I would distinguish parts of myself, my own memories, including past dreams and obscure textures in the very walls of these corridors. I recall opening my eyes in the middle of the experience a few times, only to find that the room had been rendered unrecognizable. I was stranded in an ocean of faces and beings, which flowered from the walls and ceiling. The return to “baseline” usually occurred abruptly with a deep inhalation and a sudden familiarity of the room in which I had begun. More than once, with this inhalation, I felt that life had been breathed back into me. With a gasp, I had been reborn from the depths of my DMT journey.
I believe the ketamine was extremely useful in that it both removed the element of fear and opened up dream-like associative processes in the otherwise chaotic nightmare of IV DMT. Note: I also found that the use of LSD as a launch pad creates a seamless transition and reduces the chaotic nature of DMT.
I've never tried IM 4-xx-DMT with ketamine, but my curiosity is certainly piqued after last night.