Basically everyone has that issue with 22-250 in aics mags as it has so much case taper, as you saw when you stacked em up.
Its why banana clips are ideal for cases with heavy taper, though unsupported for an aics pattern mag.
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See how when these are stacked its all basically up and down with solid contact along the entirety of the case body from the rear all the way forward.
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To get constant contact along the case body with a heavy taped case it has to curve, if you were to stack them up straight there would be lots of space towards the front which enables them to fall down in the front with a straight and even follower.
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Try to stretch the mag spring to put more pressure at the front to keep it from nose diving.