RE: Good loads for 223 bullets 40-50 Grs.
I've had great luck w/ Hndy 45gr. Hornet in an AR 20" 1-9 as well as a M700.
This load was worked up in both cases.
45gr. Hndy Hornet
27gr. H-335
c.o.l. 2.200
vel. 3500fps. +/-
100yds. (+)1.2"
200yds. 0.0
300yds. (-) 7.2
As far as the 55gr. pills go, the 55gr. Win psp (Midway bulk)
over 25gr. of H-335
c.o.l. 2.240
vel. 3200
100yds.(+) 1.5
200yds. 0.0
300yds. (-) 7.5
YMMV Good luck !