I caught one of my large peppered corydoras red mouthed pulling a ramshorn out of its shell. No idea if that happens often or not but when I reset the tank there are lots of snails in view and they disappear once the the fish are back in the tank.
Another +1 for corys eating crushed snails. When my snail population get's too large, I crush a few and let the corys have at em. However, I have never witnessed mine attempt to eat a snail that had not been crushed, so I believe you should be fine.