Ditto what Griz said. I have several manuals with data; often highest velocities with bullets 50gr and under in .223. Lyman manual says very good accuracy with 50gr. I plan on trying it and some AA-2230 the next time I find it at a decent price at a retail shop in 1lb cans. If I like it, I'll buy some in bulk. Most manuals show 22.5gr start, 25.0gr Max. Velocities top 3,400fps from 24" bbl.
I would recommend AA-2015 for bullets 50gr and less. Seems that 24.5gr comes to mind for 50gr and about 3,300fps. About like RL-7 for burning rate.(another good powder). AA-2230 would seem better w/55gr and heavier.
I too have had good luck with:
H and IMR-4198; excellent accuracy, little fast burning w/low vel's.
H322: good accuracy and velocity till Lot went bad (old surplus)
H4895; Very good, esp. with 55gr and heavier bullets
H335: good, but not as good as I had been led to believe.
BL-C2; probably now my #2 pick. Use 27.0gr w/55gr Nosler B.T. for "ragged hole", as many shots as you care to shoot through it! Very good velocities. 3,200+ w/20"bbl.
Win748; (ditto BL-C2 data/results)
RL-15; my current favorite. I get 3,000fps w/65gr Sierra 65gr BTSP and 25.5gr (not max!) and 7/8" groups from my 18.5" Rem Mod7 w/1-12" twist! Three shots, three deer; two DRT, one ran 50' circle and dropped. No bullets recovered. Intentional body shots to shoulder/heart-lungs or spine, not head shots.
Very good bullet, Sierra!
I use 27.0gr w/55gr bullet for 3,100fps from 18.5" bbl. 3,200+ from 20". Expect 3,300+fps from 24"bbl. Very accurate and meters well.
Imr-3031; OK, not greatest, but good if it's all you have.
Varget was dissapointing. Velocities were low, accuracy good though. I could not get enough in case with 55gr bullet to break 3,100fps from 20"bbl AR. I'm told it is very good with 75-80gr bullets, but I still got best results with BL-C2/748. My 1/9twist 20"bbl wouldn't stabilize 75gr and heavier bullets. Friends 1/8"-24"bbl would.