I have used the +3" @ 100 sighting for 40+ years on hunting rifles, and I'm not about to alter that now. This has always served me well, whether shooting a lowly 300 Savage or the 264 Win Mag or 7mm STW, just the maximum range at which you can hold dead on and kill an animal varys. If it is a varmint chambering, the 3" high setting can make for misses at midrange on smaller targets, so these get sighted 1½" high at 100. The Swift, so sighted, is deadly well out past 350. Regards, Eagleye.