yes they can. All the TR's and TR Pistols and stuff get that, the NAR gets that easily etc. I highly doubt that you are measuring 40 feet as 40 feet. You might be estimating wrong or something because this doesn't look that powerful.
I don't trust bands, all my rubberbands are super tight cause I got them air sealed and all the same shape and size, so I always o my testing with 1 band less than normal. My bands are so powerfully tight. I can't pull back 4.
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I highly doubt that you are measuring 40 feet as 40 feet. You might be estimating wrong or something because this doesn't look that powerful.
This is the best I can find in about 3 minutes: http://www.instructables.com/id/MSAU/
but If I build, I will put an 8shot turret on it.
good job though xD