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Semi autos can be finicky depending on the gun. If you are looking at cheap semi autos, they will probably have problems with light 2 3/4" loads. Heck, even gas guns with 3" chambers can have problems with light 2 3/4" loads. Benelli recommends (I believe) a 1 1/8 oz shot with their 3" guns (not sure about their 3.5" guns) and my Beretta needs the same to run without occasionally having problems (3" chamber).
A pump you won't have any problems unless the shooter short-strokes the gun. What makes you think that pumps would have problems?
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