I have a B14R steel barrel in the OE stock, and then picked up a B14R Carbon barreled action. It went in an MDT LSS XL chassis. The barreled action was then sent on its way as I like the steel barrel better, but I kept the MDT chassis. At this point I have not moved the steel barrel over, but I am debating moving it over to an HS Precision stock I have that I know fits me well, moving it to the chassis, or just letting it ride in the HMR stock for a while longer.
I have no issues with the HMR, as a whole, and think its a great option - but sometimes you just gotta find what seems to work best with what you are using the rifle for.