As 8andbait mentioned RL-22 if you can find some is about the best going for the 25 and the 115gr bullet IMO.
I tried about all of the "BEST" powders back in the late 80's when I got my standard version up and running. It was an off the shelf Rem 700, and shot like a house afire from day one. I used IMR-4831 to easily hit the mid 3300's with the 100gr BT and Partition and used IMR-4350 for the Sierra load for about the same velocity all from a 24" stock barrel. When I worked up the load for the 115gr Partition and switched to RL-22 it was simply magic on everything I put them on.
With the 115's I used the RL-22 over the Win WLR, well actually I used the Win to light off everything BUT the Sierra load which used the CCI-BR2.
After many years of sticking for the most part to the 115 Partition I decided to give that rifle to my daughter. It just so happened that Nosler had just come out with the AB and I picked up a box of the 110's to try out. I didn't change anything from the 115gr load except the bullet when I seated the 110's. The first three shots at 200yds we actually had to ride out to distinguish they all went through the one ragged hole. I loaded her up 50 of them and delivered it to her on Christmas.
Since then she and the grandson have both taken a few VERY nice deer using it. It isn't quite as up to the bigger hogs as the heavier Partition so she will be switching back to it for this years hunting and will probably stick with it from now on out. If the rifle were still mine I would be still shooting the same ol load year in and year out as I always did. I can still put them into one ragged hole or VERY close to it out to 250 - 300yds with it even after all these years.
I moved on however and built myself a bit faster version in a 28" 25-06 AI. Now with that one I am becoming as fond of the 120gr Remington CL bullet, as I was with the Partition. Only time will tell if I stick with it or not.
I wish you all the best with yours, I just wished that things weren't so crazy right now and that things were more easily attainable. Sick with the slower powders and you will find happiness.