I've used everything from IMR, Alliant and Hodgdon, with burn rates from SR 4759 to 4831/ RL 22...

In a good 243 barrel, I have never had one that didn't perform very well, with the exception of H 4895 which was very finicky..

I have one Rem 243, that is an accuracy disaster... but it likes SR 4759 a lot and also, likes loads that rocket the bullet about 10% OVER max load...

"Minus the killings, Washington has one of the lowest crime rates in the Country" Marion Barry, Mayor of Wash DC

“Owning guns is not a right. If it were a right, it would be in the Constitution.” ~Alexandria Ocasio Cortez