I've listened to 新闻联播, the way they pronounce shi sounds much closer to sure than to ship. It is somewhere in-between, and that vowel is more rhotic in Beijing

I've listened to 新闻联播, the way they pronounce shi sounds much closer to sure than to ship. It is somewhere in-between, and that vowel is more rhotic in Beijing dialect, but Standard Mandarin definitely still rhotacizes that vowel (especially compared to southern dialects where it isn't rhotacized at all).