The Ruger investment cast receiver is indeed strong and dependable. I think they kept that information sort of close to the vest back in the 1960s when they introduced the Model 77. There was some stigma about casting vs forged receivers, but Ruger has proven to my satisfaction that they will hold up about as well as a forged model. To my mind, the only thing a quality forged receiver has an advantage is that it can be made a bit thinner than a quality cast receiver.
Sort of like multi piece bolts.
The Remington 721, 722, 700 and other products all use a multi piece bolt, but they are brazed together so expertly that you really have to look hard to find the braze line. The bolt parts are all good steel and in no way give up any real strength to a one piece bolt that some seem to think is superior.