Actually here is a better size chart.
Cocks Hens
Class A - up to 350 grams (12.35 oz.) Class A - up to 325 grams (11.46 oz.)
Class B - up to 500 grams (17.64 oz.) Class B - up to 425 grams (14.99 oz.)
Class C - up to 600 grams (21.16 oz.) Class C - up to 500 grams (17.64 oz.)
Class D - up to 750 grams Class D - up to 600 grams
Cocks Hens
Class A - up to 350 grams (12.35 oz.) Class A - up to 325 grams (11.46 oz.)
Class B - up to 500 grams (17.64 oz.) Class B - up to 425 grams (14.99 oz.)
Class C - up to 600 grams (21.16 oz.) Class C - up to 500 grams (17.64 oz.)
Class D - up to 750 grams Class D - up to 600 grams