I have a Ruger 77 in .416 Rigby that I used on a recent Cape Buffalo hunt. It's got a barrel band for the sling, and presents no problem at all. It shoots 400 grain Barnes TSX, and Woodleigh 410 grain solids into the same hole at 100 yards from the bench. I shot my buffalo at 163 yards, using shooting sticks and a sitting position, and also was in a tight sling. The shot was quartering away while the bull was laying down, and I hit it just behind the near shoulder, center punched the heart, and the TSX was recovered under the skin of the off shoulder. The p.o.i.was exactly where my PH told me to put it.