Nubo and Bigbulls have spoken well!! I have used both the magnus and Montec heads with terrific results.

I see you are pulling 40 pounds. I don't think you are going to have a penetration issue, but if you find you are not getting the penetration you hoped for here is some food for thought.

It is commonly accepted that all things being equal a three blade head will penetrate better than a four blade, and a two blade will penetrate better than a three blade due to less friction. With your short draw, and low poundage (realitively speaking) I would test a quality two blade head and see if your penetration is improved over the three blade Montec. The Montec is a great penetrating head as it is really a three blade cut on contact head, so there may or may not be a significant difference. However unless you test it with your equipment one will never know.