IIRC the Savage was the Model 87. The Stevens 87 says "Long Rifle Only" but looks the same.
That's two of the 87s. My first .22 rifle that I had my Dad buy for me with my newspaper route money was a Springfield 87. Still the Savage design with just another name for marketing indirectly through hardware stores and the like. My 87 would function well with all three cartridges. Later, I noticed that Savage altered the 87's design to accept LRs only. They shortened the barrel as well.
By the way, my 87 did not have a floating chamber. It used a short weight recoil spring and just took the punishment from the longer two cartridges.
Looks like there were two different looking versions of Model 87s. The older ones kind of have a hump back look, a button bolt handle, and distinctive venting cuts behind the chamber. My Model 87 looked like the ones in this Springfield ad. More slender with less pronounced venting cuts.
http://cgi.ebay.com/1963-STEVENS-MO...imsxZ20090123?IMSfp=TL090123111006r13556 
