I have only shot ONE antelope in my life. My First Western Hunt. It was 1978 0r 1979. The rifle on that Mule deer and Antelope hunt was my Brand New Weatherby Mark V Deluxe, in 270 Weatherby Mag. The load in the rifle was the Speer 150 Grn Grand Slam , a 3000 fps load which I had made up for Mule deer. We came upon the "Goat", at under 220 yards ,and it was in the 14 inch range, and my guide said take it. So I shot it broad side, and hit it, and hit it again, and hit it again, all broad side, as it ran. I thought I was missing it, so I put two more rounds in the gun and fired a round out to the ground in front of it. It turned and when it did I saw blood trails running down from the three exit holes. I learned a sad lesson on my first antelope hunt. So for me, shooting tough big game bullets , on small ,soft skinned game, is a bad idea. Since then all my white tail deer and future antelopes, will be taken with bullets that will expand easily . I don't need thick Jackets and 18 inches of penetration on such small light animals. I have settled on the 130 grn Nosler Ballistic Tips, in both my .270 Win and my .270 Weatherby Mag. I am very pleased with their results. Never an exit hole. Many one shot kills. I would also love to learn more about the 117 Grn class of 270 bullets. So if your 107 grn. SMK's are working well, then it seems you have found yourself a really good bullet for your antelope hunting. Well Done Buddy !!