Yes I still do intramuscular with this slins and I can go just as deep.Here's the technique in a nutshell.You'll never suck oil up with a slin pin so you have to draw your compound or compounds with a regular pin. Next pull the plunger out of the slin pin or pins and fill with your loaded regular pin. Now carefully start to insert the plunger with the pin in a downward position, as you insert the plunger point the Slin pin upward now allowing any air to move to the top of the Slin pin and out. In order to get a deep inner muscular injection you have to force that base of the Slin pin about a half an inch past skin level. You're right about the volume issue, it's not too bad on this cycle because I'm using half of a CC of Tren and half a cc of prop. I have 200 mg/ml prop so volume hasn't really been an issue on this cycle but I would not have any problems doing two injections at the same time with this technique because it is just so smooth and easy and opens up more injection sites for me.