SR4759 for 250 to 300gr bullets. Somewhere around 42-43gr. Great powder for all weights but no longer offered.
N110 for 225gr to 250gr bullets. It can be quite rough on sabots especially with 300gr bullet and "old book load data". Stay between 39gr and 41gr. Great speed and super clean too. Works ok with even less powder if needed.
Reloder7 for 300gr to 325gr. A little dirty but very easy on sabots. About 63gr has been the sweet spot. 60-65gr would roughly be the range. Good cheaper powder and easy to find.
N120 for 275gr to 300gr. No more than 60gr for a 300gr bullet and 63ish for a 275gr bullet. Typical range is from 56gr to 60gr. Excellent speed and another super clean powder.
If all you want is BH209 type speed you can use 5744. Its a dog and dirty but otherwise very dependable. Probably a really good choice if you want to shoot 250gr-300gr XTPs at less speed. I never cared for it personally.