Blackpowder
How 'bout some 40mm casings loaded with about 3 to 4 ozs of FFFG blackpowder. An associate of mine uses this in his 37mm A/T gun. This is unless of course your Bofors has a welded up or inoperable breech.
My other suggestion is to take the same amount and pack it into a toilet paper tube, duct tape it up and insert a lightable wick (cannon cord), drop down the barrel and off you go. Works well on pop can mortars as well...
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