^^I had the opportunity to actually shoot a GRS with a can, next to mine which did not. The rifle with a can needed no special modification, other than removal of the factory flash cage. Exactly which can it was I don't remember, except that it got very hot after not that many rounds.
The GSR was my first Ruger bolt gun; I have owned numerous other Ruger products before that with complete satisfaction, but as a Remington 40X & 700 user I was not that impressed by what I actually saw and experienced in the original 77 as far as accuracy was concerned. However, after now owning two GSR's, I can honestly say that both have given very good accuracy, often under one minute when of course using good ammunition.
When I took the Scout Rifle class at Gunsite last year, the other students and industry reps had all experienced the same thing. On top of that, the platform seems very robust and reliable. They have become my go-to bolt gun for just about anything at this point, and I am sold as far as the applications I use it for.
While the GSR is not a true Scout Rifle as defined by Cooper and the others who convened on that project, it suits me very well. If I wanted to have a true Scout Rifle, I might start with a Remingtom Model 7 and see what I could do with that.