I have recently tried Superformance and 75 gr hollowpoints with good success.
Other than that 760 has been a go to powder and lighter bullets. I have tried Varget and not been happy at all.
I currently load for 3, 243's and it amazes me how they like different bullets and loads.
One of my 243's digests nothing but Sierra 85gr HP's and IMR4350 and it has for more than 25 years.
I don't have the experience that Bruce has but I have been loading for the 243 since 1979.
David