That is a really high concentration and it will probably be painful. I would go with 200 mg/mL if I were you but here you go....
10.2 grams test cyp is dissolved in a mixture of 5.1 mL benzyl benzoate and 0.26 mL benzyl alcohol by warming with a hairdryer until a clear solution is obtained. This clear solution is diluted to 20.5 mL with sesame oil and swirled or shaken to get a clear, yellow oil solution. The solution is filtered into a sterile vial through a 0.2 micron sterile filter. Another 5 mL sesame oil is filtered into the vial (to flush the filter) to obtain 25.5 mL of a final mixture that is 400 mg/mL test cyp, 20% BB, 1% BA.
The extra 0.5 mL insures you will have enough to make up for any lost as residues in syringes, etc.
I must add that I don't know for sure if you can actually get all that test cyp to dissolve in that much BB and BA. I have only made 200 mg/mL before (which goes in just fine).
I've made 400mg cyp before and unless your taking it with something it is a little stiff if your not cutting it with something. 300 is nice if your taking it strieght. 500mg/ml is as high as you want even with blended esters.
For myself I recomend 3% BA and 12%BB as 20%BB hurts me. In fact I don't like going over 20%total solvent unless necessary. That is JMO though.
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