I've killed a hog, a Coues deer, a blacktail with them. They fly very well, and I like the design. However, as with everything in life, there are always trade-offs. You won't get as large of an entry hole as you will with a fixed BH, which might mean less of a bloodtrail. (Fortunately, all three of the aforementioned critters fell in sight, so I didn't need to bloodtrail.)