RE: Looking for a new powder & load for my 223?
2230-c is a very good powder for bullets under 55 grs and r-15 works very well in 69 gr match bullets in my savage 10 fp.
You can get the 2230-c pretty cheap,around 60 to 70 dollars for an 8 lb jug and meters very well.
For the 55 gr bullets I like IMR 4895 the best