[JD0x0]

.223WSSM isn't bad, but compare it to .243WSSM and you'll realize that there isn't much point to it. It's more overbore, uses lighter projectiles with fairly mediocre BC's, and isn't much faster than the .243

.223 WSSM

40 gr (3 g) BT (boat-tailed) 4,352 ft/s (1,326 m/s) 1,683 ft·lbf (2,282 J)
60 gr (4 g) JSP 3,733 ft/s (1,138 m/s) 1,857 ft·lbf (2,518 J)
75 gr (5 g) BT(boat-tailed) 3,378 ft/s (1,030 m/s) 1,901 ft·lbf

.243WSSM

58 gr (4 g) VMax 4,068 ft/s (1,240 m/s) 2,132 ft·lbf (2,891 J)
70 gr (5 g) BT 3,707 ft/s (1,130 m/s) 2,136 ft·lbf (2,896 J)
80 gr (5 g) BTSP 3,545 ft/s (1,081 m/s) 2,233 ft·lbf (3,028 J)
90 gr (6 g) SFT 3,280 ft/s (1,000 m/s) 2,151 ft·lbf (2,916 J)
100 gr (6 g) BTSP 3,136 ft/s (956 m/s) 2,184 ft·lbf (2,961 J)

The .243 WSSM is a little faster than the .243 Win, but generally has lower ammo availability and more expensive ammo.