For salted rim, run the lime slice along the rim of the margarita glass. Pour sea salt onto a small plate and swirl the moistened rim into the salt to adhere.
Add the raspberries and simple syrup to a cocktail shaker and muddle.
Pour in the tequila, Chambord and lime juice and add a handful of ice. Put on the cocktail shaker top and shake. Strain into an ice-filled glass. If desired, garnish with a lime wheel.