I recall in one of Robert Ruark' s articles he wrote about his .470NE as I recall would double if the front trigger was fired first, though he gave no explanation as to why. Seems as on this particular hunt he shot a nice horned "Pink Elephant" ( It had been wallowing in some red ocher earth) in the rain & remembered to pull the rear trigger first. Then hs guide, Selby I believe, told him to go up & give it that insurance shot, so he shot a dead Elephant & having reloaded, forgot & pulled the front trigger. Flipped him head over heels into a thorn bush.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra