I once hit a g1 the morning after a day in which i began to lose my voice from screaming and yelling, and in the morning I can usually hit an a1. If I can hit those notes sometimes, then I should be able to hit them all the time, right? Will vocal training actually enable me to hit those, or is there another way?
I think that vocal training could help you hit the notes you want to, but you can also sing scales every day and just keep singing the low notes. It may take a while to see a difference, but it will happen! 
Good luck!