Don’t know the mass, but it plays medium and high compliance carts with no issues at all. Running AT carts, ADC, Empire, no problems.
You’d be hard pressed to do better than the 463 unless you’re willing to spend $3,500+. Compare features.Quartz Lock, strobe, die cast precision machined platter, dust cover, stainless steel spindle, precision motor bearings, jeweled tonearm bearings, precise counterweight, isolated motor/plinth, isolation feet, full auto play, and more. A carbon fiber tonearm doesn’t get you much; cheap fishing rods use the same. Precision alloy damped tonearm is far more costly. Removable, adjustable headshell. Add it all up! For a Rega equivalent, $3,500+.