https://www.nzhuntingandshooting.co.nz/f12/223-deer-64884/
Pages of reading about the .223 on deer.
Ive got a Sako 75 stainless laminate in .223 1-9 twist, be an ideal tool for the original posters rifle,
Ive shot thousands off Deer ( Reds, fallow, sika,) and goats when culling and meat hunting in New Zealand, most with a sako vixen .222, don’t recall ever loosing a deer, goats likely yes, most due to numbers, deer come in ones and twos, goats in mobs of 20-100 at times, get in close, under 100m normally, pick your shot, and use a suitable bullet, un alarmed game, are easier to kill cleanly, and shot again if still on there feet.
.222 and .223 are better tools now, than 30 years ago, faster twist, heavier bullets and copper Barnes weren’t choices back then,
I don’t think the .223 is an ideal deer rifle, but it is suitable in right hands, on the right sized game.
Now days in my light compact rifle in NZ is a 6x45, same case (.223) 6 mm bullet, very effective with a 85 gr soft point,