I agree with Bisch. You are probably between 3555s and 5575s. I made up an extreme FOC arrow for my 46# RER and it worked out to a 5575 with 320gr total up front and 31" long. I shoot 3555s at 30" with 225 total (including insert)up front that also fly well.
Unless you already have a lifetime supply of 300 gr points, I would second Bisch's recommendation to see where the arrow tunes before deciding on an exact point weight. A 45# draw with a razor sharp broadhead of 200gr or more will penetrate VERY well.