I don't know the guy but I was under the impression that he FIRST designed them for the SOCOM then started making them for ML's. Since the .458 SOCOM is generally a very short range weapon it wouldn't surprise me at all that they are limited to around 150 yards. I know mine gets iffy to say the least at ranges beyond 150. I've stretched it to 200 a handfull of times on hogs using both the RN and FN 350 gr Interlocks with good results as far as kills. A couple passed through on rib to rib and one through the neck. The rest were shoulder shots with the bullets landing in the off shoulder. I would expect these to MAYBE pass through at 200 on shoulder to shoulder on medium hogs since the BC is only .040 lower than the RN (Hornady Interlock 350 RN is .189) but these seem to penetrate MUCH better at lower velocities.