Looks pretty good, I would just weigh up whether a bolter would be better with BS5 (hitting on a 2+) or being master-crafted (re-rolling 1 failed hit). You probably have a better idea than me (I play CSM), but its always good to try a few different things.
"That which we foolishly call truth is only a small island in a vast sea of the unknown. For man to truly flourish, he must be willing to abandon the ever-shrinking island of such petty 'truth' and surrender himself to the reality of that which is beyond."
Dark Apostle Erebus, architect of the Horus Heresy