I think it's down to the "chance" that round could be mis fed into the breech with multi shot magazine. I personally have found that my multi shot SE is more consistent over perhaps a 20-25 shot string with its single shot adaptor than it is with its magazine. Naturally, it's an opinion, but maybe in hft where every shot counts, as it does with live quarry of course, and competition settings create a mind over matter thing, other than the no no with multishot rifles, they perhaps make the shooter mentally more comfortable, therefore shooting more consistanly, as they can feel the pellet into t