the Win M70 I shot was a brand new gun, the owner was just breaking it in... or trying to before the sharp pain to the shoulder stopped him. he had both me and another shooter (both very experienced with heavy rifles) try the gun and we agreed it was horrible. perhaps the gun fits some people just right and doesn't feel bad to shoot or perhaps people are putting a very heavy scope on it (the gun I tried was just iron sights).
I cant comment on the Kimber Caprivi other then that its VERY LIGHT. I handled a Caprivi in 458 Lott at the Dallas gun show and it was under 8 pounds which was just silly for its chambering.
-matt