I agree that the match king isn't known for expansion. Depending on the game warden and the judge if anyone was caught using them it may be a bad choice of bullet. It do say on Sierra's website they do not recommend them for huntingI tried the .223 for awhile and found that no matter what, while the shot would be fatal it would take about 75 to 100 yards before the deer would realize it was dead. These shots were at less than 100 yards using Nosler Partitions. I do not recommend the .223 for deer hunting and especially not over 100 yards. In addition I do not recommend, nor is it legal to shoot deer with any non expanding type bullets here in Wisconsin. Note this is my recommendation based on MY experience hunting deer with the .223. Other opinions are bound to vary.