25-06, if you can find some old stock AA3100. Discontinued some years back, speed and accuracy with a Hornady bullet. Some vendors told me it was the same thing as xyz powder, not in my rifle.
270, my first center fire rifle cartridge. I was force fed the kool aid of 4831 and a 130 grain bullet for years. Yes it “worked” though it always left me thinking it was capable of better. Reloader 26 entered the picture a short time back. I went with a 150SST and worked my way to a book max(different 150 in their data). I ran over the top a half grain or so, no pressure signs but no speed gains either.
Some have said R26 gets spikey. I tinkered with my loads in summer winter and fall with zero issues. YMMV. Mine now thinks it is a mid range 7 mag.