Calvinists assert that Jesus died only for those that were unconditionally selected to be saved. To say that there is even a hint of truth in such a perspective seems to fly in the face of the scriptures which universally assert that Christ died for everyone. Not everyone gets saved, however, which leads one to question in what way did he actually die for all when only some are benefited. Certainly, there is no doubt that he died for those who are benefited.
From one perspective, looking at efficacy, there is no argument--Jesus death was for some and not for others. From eternity looking back on time, such an assessment would seem to meet the facts as they will be: the repercussions of his death and resurrection will affect some, but not others. To look at that reality from that perspective and say Jesus died for the benefited is a spin that one could technically make and be accurate as far as it goes.
The problem with this view arises when the horizon on the subject is stretched to include intent. Since intent in this regard involves the counsels of God, humans can only know what God tells us about his intent. We cannot figure out the mind of God in this regard, nor infer what our reason tells us he must have been thinking. That is error prone when done between humans, it is idolatry when done concerning God.
God has spoken concerning his intent in offering Christ as the atoning sacrifice for humanity's sin, and has done so conclusively. Christ died as a bonafide sacrifice for all. Whosoever will may lay their sin stained hand upon the head of the scapegoat and tap into its benefits. That anyone who does so requires the intervention of God to do so does not mitigate or limit the expansive intent of the offer, anymore than does the outcome. Jesus is the savior of all men, but especially for those who believe and are benefited.