I have 2 complete rifles with MRC actions, 1 300 wsm, and 1 257 wby mag. I am also in the process of having a 375H&H built off another one. If you do a search you will find that the are pretty heavy i.e 44oz. The quality control seems a little spotty in the older actions, but my experience with their customer service has been excellent.

I buy them with the notion that they will need another $200-$300 to fix them up and make them respectable to me. However I tend to do the same with Remington and Winchester actions as well.