I have shot 60 + feral hogs of all sizes with the Privi in 9.3 x 62 with the 286 gr conventional round nose soft point. No problems yet, have only recovered @ 5 bullets or pieces to analyse.Typical cup and core bullet performance.
I have shot at least 20 Texas Whitetails (not the little Hill country types, but the somewhat larger deer we have on the Rolling Plains) with the 139 gr 7x57 soft, with typical results.
These deer were mainly does and small bucks taken during culling here on the ranch.
I would not hesitate to shoot the ammo on our deer. I would compare the 7x57 bullet's performance with the 145 gr Win. Power Point in the same caliber.
Only my observations, but then I remain amazed at all the thought that goes into bullet selection for deer.
I fail to understand the need for any type of "Premium" (high weight retention) bullet for deer hunting.
I have good friends (knowledgeable gun guys) who disagree, but they lack the level of experience I have in shooting deer.
I have limited experience with the 180 gr Privi soft point in 30-06, 7 hogs, I think, but performance was similar.
As an aside , I note your comment about S&B softs " failing" but I have extensive (300+ wild hogs) experience with the 173 gr S&B "CE" (cut edge) soft point in 7x57 (my 1932 Mauser Type B Sporter is regulated for the 173 gr ) Very satisfactory performance.
While the isolated instance I'll report next is certainly not conclusive, it is my observation.
One of my best local Mule deer Bucks taken on this ranch was taken with a S&B 286 gr soft from a 9.3x62.
I shot the buck at 78 (lasered) yards standing straight on directly in the brisket, he dropped at the shot after a violent falling flip.
We recovered the cup section of the bullet in the rear of the rumen with a retained weight of 168 grs.
Very suitable performance from a conventional cup and core soft.
Again , just personal observation. Your results may vary.