in the video I watched best man said the kill time was longer than the DMR or carbine.
Carbine
18 shots per clip
7 shots to kill
2 kills per clip (max) (2 kills and 4 shots [4 shots being 4/7ths of a kill] ~2.57142857 kills)
42 frames per kill
1.4 seconds to kill (exact)
DMR
15 shots per clip
5 shots to kill
3 kills per clip (max) (3 exactly)
44 frames per kill
1.46 (repeating 6) seconds to kill
BR
12 shots per clip (36 bullets)
5 shots to kill
2 kills per clip (max) (2 kills and 2 shots [2 shots being 2/5ths of a kill] = 2.4 kills)
55 frames per kill
1.83 (repeating 3) seconds to kill