Hi Al in Nebr. Welcome to Greybeards.
I believe our friend is refering to the "Red Mist"? If so, yes I have seen it on a few occasions with my 223 H&R Ultra. There is actually a club -"seekers of the red mist" . Though I for one don't personally enjoy seeing it.
Anyway to answer your question I have seen it on a few occasions, with the WWB 45gr JHP's, Some handloads with Hornady 50gr V-Max Molys, and even some cheap 55gr UMC FMJ's-I really don't recomend these for varmints.
If it's a recoil question, then I don't think you should have much to worry about, seeing as how the 223 hasn't got much in that department, especially compared to many other varmint calibers.