Hi Gege ,
I would rate Cubera 125 and Cubera 150 as still " medium " sized chuggers and Cubera 180 as large sized chugger , however some other lures which may only weigh 150 gr. but the body size may be larger , dimensions wise , than Cubera 180 should be rate as " large " sized chugger too .
Casting weight wise , CV79/40RF SHP is rated at 200 gr. , one should take into consideration of the weight of the hooks n splitring in this case and it's easy to exceed this max. casting weight when one uses ST76 , GT Recorder or large Decoy trebles and #11 Owner Hyperwire splitring so it is no surprise a bare 150 gr. chugger is felt as maximum for CV79/40RF SHP because a pair of big trebles can weigh as much as 40 gr. .
Method of casting also play part in casting these heavy lures a the required distance , an advanced caster will know what to do in such situation .
Jon .