I just did a test of @AlphaOmega TestC 300mg/mL using a 30g slin pin.
I heated the oil in a heating pad on medium heat for 15 minutes, Oil drew quickly and smoothly without the need for backloading. The oil injected smoothly and easily. Injection site was the VG.
This test proved to me that it is unnecessary to cause any increased trauma injecting AOL’s TestC with a bigger gauge needle. Long term use of the slin pin will decrease scar tissue buildup, makes for a more pleasant injection experience and saves money on supplies.