This is the basic rule regarding bullet weights and twist.
Faster rifle twist ratios allow for heavier bullets to be shot more accurately through the rifle. For example, a .223 barrel with a twist ratio of 1:12 may only be able to shoot a 40-52 grain bullet accurately, while a barrel with a twist ratio of 1:9 will be able to shoot, accurately, any bullet between 40 and 65 grains, it will also compensate (to a point) the .223's tendency to tumble after penetrating a target.
But, remember each rifle is different. Even with the bullet weights being the same, the rifle may like one brand better than another. One of my 223 barrels likes Remington 55 gr. ammo, the other one likes Federal, but both shoot all brand including combloc (Wolf, Tula) stuff decent. Just remember, H&R warns you not to shoot 5.56mm in your gun, because it will void the warranty.
Have fun experimenting, enjoy the rifle, and let us know how you make out.