2 quick questions bro's.

1) can I use s 27 gage 1" needle to shoot 0.5cc of Test 250 in my butt?
2) can I use the SAME needle to draw and shoot my deca and Test?
- And if "YES", which one do I do first, the .5cc of test, then the deca, or vice a versa, or does it matter?

Thanks Bro's