There are some people that use pistol primers in rifle cartridges. Its been awhile since I read that article, but I think it was in a .22 hornet, which is not a high pressure round, nor does it have much case capacity. Most importantly, it was someone who knew what they were doing.
Do not use pistol primers in a .270 win.
Save them, some day you may have a pistol, or maybe you can trade them to someone who does.