I've used powders with burn rates from 4198 to 7828 and every thing in between... ALL of my 243s have been accurate beyond what is needed for deer hunting...only real decision is what sort of velocity ya think ya need...
2600 to 3100 fps or a little more has been quite possible...with no velocity more accurate than the other...
mine are Ruger, Winchester, after market barrels and A Remington ADL...
