Can't afford a chrony and Mrs hasn't gotten round to clubbing yet...

1322 Medalist will easily punch through a beer can (both sides) at 10 metres, obviously. At 10 pumps at the same range it makes a whacking great dent in a lidless baked-bean tin full of water but will not penetrate. This is will .22 Eley Wasps (cheap for plinking).

At 15 pumps (I have to put the effort in to the tiny girl) it punches in and lets water out.

Question is, at 10 metres, what approx. min. ft/lb-age is required to a) pass one side of the Heinz tin and what for both sides?