Finally got around to loading some 223 for my Chinese rifle. 55 grain Hornandy SPSX bullet using IMR4198 for about 2900 fps. This is a nice light practice load I have used in numerous 223s over the years. Functioned perfectly. Was time limited so only shot 1 group at 25 yards on paper, 5 shots. Made a ragged hole that could be covered with a dime. Will report on longer range groups. This load looks promising. Rifle has a Mojo rear sight. No scope yet.