You rang?
The answer you seek.
As it happens I was out shooting some of this ammo a couple days ago.
This hardcast SWC load runs right at 900 FPS from my 5" M29.
Shooting some through both my 5" Model 29 Classic with RDO, as well as my late 1950s era Ruger Blackhawk Flattop .44 Mag.
It is very easy to see the difference when one's eyes change (and the front/iron sights become a bit out of focus).
This was shooting over bags at 25 yards. The bags were on the back of my old Land Cruiser. With the S&W M29 and a red dot, it was quite easy to punch tight little groups.
That was not exactly the case with the irons. The group was not terrible, but it was nowhere even close in comparison. I also noted that I must have had the gun zero'ed for 300 grain loads before as I was hitting very low.
Note the point of impact is WAY low, and the group size is well more than 2x the size, without the "flyer" which I am sure was just me. Really I would say the group size is 3x as large with iron sights as it is as compared to shooting with a red dot equipped pistol.
Pretty telling.
Very accurate load, just have to have the ability and equipment to take advantage of it.
The M29 Classic (with RDO) is definitely the "equipment". Love shooting groups with that gun.