Finally, Gtscotty hit the nail on the head.
The SST is a fairly frangible bullet. At that close of range, the velocity on that load is in the 2,800fps range which is the upper limit of impact speed for which that bullet is intended/designed.
Extend the range to 200-300yds, and the impact will be a little less dramatic, and penetration greater. I'd expect to see it penetrate 5-6 at that range.
What you've got is a long-range bullet that is intended for light big-game. Excellent load. I typically have used IMR4064 or BLC2 for over 3,000fps from the '06. Killed over 100 deer since 1976 with the .30/06. Ranges from 40' to 275yds.
I'd suggest for the "close in" shots, use a conventional bullet. Since you like Hornady, use the 150gr Spt "Interlok". It'll hold together a little bit better, is just as accurate, and cost 50% less.
BTW; for my M-1, I use that exact same load with a 150-155gr FMJ or BtHpt match bullet. Gets 2,775-2,825fps and is guild-edged accurate.
Your load with IMR4895 is what the military used in the .30/06 for close to 50yrs.
For even better close range performance, go to a 165 or 180gr bullet, use 46.5gr with 165 and 44.0 with the 180.
My current "close range" load for the bolt action '06 is 50gr of IMR-4064 under a Prvi-Partisan 150gr Spt. Not a "tack driver" (1.5moa or so from my Colt Lt.Rifle), but an inexpensive "shooter". It dropped two does with two shots back on Jan. 18.
I bought 500 Remington 150 CorLokts back in 2006, and when I exhausted that supply, I bought a bunch of the P-P from Graf's. The Corlokts were superlative bullets. I miss them now that they're gone. They haven't been available for 2yrs now, and when they're available, they're nearly twice as expensive as the P-P's, and 50% more than the Hornady's, Speer's, and Sierra's.... They "aint that good"..... (listening Remington/Cerebus ????).
For accuracy, the Sierra's are unexcelled. However, if I expect shots over 300yds, I've got a couple of bean-field/airfield guns that get the tap. Typically, my .257wbymag or the .300RUM .... but if walking is involved maybe, the .260Rem. My problem is I've got TOO MANY CHOICES.....