Will the snails cop(per) it this season?

I read in the gardening book that RMan bought me for my birthday that one can use copper pot scourers to deter snails.  I have tried coffee grounds, crushed egg shells and empty loo roll holders - with varying degrees of success - they have to be replenished / replaced every time you have a good downpour, or the watering is too severe - and how many eggs do you / can you eat in a week...?. But