You'll really like 335 in the 223 with 55s or so; doubt it'll be of great use in the 243. But it is an acceptable powder in the 30-06, especially with lighter bullets. I've used it up through 150 or maybe even 165 grains, but it is listed with even heavier weights. It just seems a bit quick for them. It is too fast for most loads in a case as large as the 243 as compared to bore size. I've had good results with lighter 130-ish weight in my 7mm-08. It's superb in the 30-30 and 308.
I have found some nicely accurate loads in my 7mm-08 with 380 but it isn't fast. I've gotten some interesting results with 380 in the 308 and 30-06 which lead me to believe that it can be a rather aggressively violent/abrasive powder under certain conditions. Splitting case necks has been one of the rather unpleasant results I've seen with it. Works great in the 22-250 through.
