Use the Berger Hybrids and just shoot behind the shoulder close or far they will do the job. Berger bullets are designed to penetrate a few inches and then open destroying the internal organs. Practice and good marksmanship is the key. I started using a custom built 25X284 and I shoot 133 gr Berger Elites and they are devastating on elk from a cow at 75 yards to over 1000 yards. You cannot push those mono bullet fast enough to do what the Berger's will do at long range. I would feel comfortable shooting this rifle to 1200 yards easy and anything in between. Last but not least is stop shooting the shoulder on elk! Put it in the boiler room and they go down. DRT!
Gday priely isn't this thread on what longrange bullets do up close
so what happens when the critter spins on a dime & the left last rib is encountered or worse a even harder quarter away while you've squeezed off yep your Berger ISNoT your pill but if you just want to kill ok it will do that ( also maybe a lost critter a possibility) but other brands /types will do a way better job , that's my position & always looking forward to seeing more & I note you stated the 133 gr 25 cal Berger which wasn't around in my day when I used bergers & A high probability it is no different than a lot of others I've used but that's my thoughts & previous experiences
So a Couple questions
1/ why are you saying stop shooting the shoulder ( angles / resistances for my reference only )
2/ what was the shot placement on the 75 yard & over 1000 yard
3/ what were these velocity impacts
4/ where did the 2 ranges open up on impact of the pill in the critter
5/ was a exit achieved if not position of retained pill & weight
6/ length of penertration
7/ where on the length of this penertration did the wound channel start to lesson or was it the same all the way through
8/ the pills path straight line or not even tumble ( but that's hard to see all the time with clarity )
There are others but I will leave that for another day & im not being smart or just flinging things out there as I carefully take note of all of those above & more & also it's not done off one impact /angle to form a base of where a pills weaknesses are as if we can help stop even one of those weaknesses happening that's great news for us & critter
Mine it was done over more than I'll mention here but a few know I didn't mess around
Just for note zoom up on my avatar as these just arrived home & were only a small sample of what was taken in about 10 /12 days hunting / testing not all mine but my hands got a little bloody lol yep going through those questions above & more
I'm no guru just lucky to have done what I've done & taking notes while observing along the way has been priceless / clearer for me on what pill to use on what & where
cheers