Since you're interested... After bumping a herd of 15 antelope about a mile away, I asked my co-worker to stay within sight of them with his 4 wheeler to draw their attention. I walked out of their sight then walked within roughly 300 yards out of their sight. After crawling about 100 yards around a hill I spotted this one. I fired a 100gr Barnes TTSX a little high in the shoulder. The rest of the herd scattered except this one. It started walking toward me! At the time I didn't think I hit it. I crawled around the hill out of it's sight, but as I crested the hill it spotted me and run. I dropped it at about 150 yards on a dead run with a shot only 1 inch below the first paralyzing it. I'll post the handload data in a little bit. I always seem to shoot high with my 257 even though I use a rangefinder.