Seeking information on deer kills with Speer Gold Dot 123 grain 7.62x39 bullets. Seeing Ingwe's success with them in .223, I can't help but believe they would be good in the x39.

Not the 7.62x39 but in the 6.5 Grendel they do a number on large hogs.

And these are 120 grain.

6.8 SPC and Gold Dots = Dead pigs and whitetails

I have a box of the 7.62x39 Gold Dots. I’m going to work up a load for my 7.62x39 AR to try them out.

Even without first hand experience of this specific GD bullet I have high confidence.

Speer seems to know that they’re doing with their GD/Fusion bullets and ammo. The bullets are well designed for good performance within the velocity range of the caliber for which they are intended.

Yes, my experience as well.

I guess they kill very well.

Ive been shooting stuff with 55 grain gold dots out of .223s...they work.

I have used the 62/64gr version in .223 Remington for pigs and deer to good effect.
Was curious about the 55gr version for my slow twist 1-14” twist .220 Swift. Might try the 55/62gr in that gun and see which shoots best.

Can't speak for this particlar bullet, but if you are still looking try the sierra #1365 55gr btsp. Have killed many different animals with it and extremely accurate.
YMMV
David