I used 70 grain speer bullets in a 22-250, 53 TSXand 55 TTSX in my 223 WSSM on deer. We used the 55TTSX in the WSSM on Antelope too.
I shot a couple deer with 223 rem and FMJ's. There was a brand that had a flat nose FMJ, dont remember what brand, it was the late 80's.
Recently my stepdaughter shot her first rifle deer with a 223 and 64 grain Nosler bonded bullet. She hit it in the spine and the bullet put a fist sized hole through the spine. DRT.
This year I am loading 62 TSX in my 223 WSSM. Most likely just for antelope as I have more guns that I want to shoot deer with this year than I will have tags.