The Bertram 46.6 1975 vs Bertram 510 Convertible 2000 comparison sits squarely in the category of decisions where specs alone won't tell the whole story — intended use, storage, and long-term ownership costs all factor in.
The power gap is worth calling out. Rated to 1 050 hp, the Bertram 510 Convertible 2000 has a 615-hp advantage over the Bertram 46.6 1975's 435-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Bertram 510 Convertible 2000 carries 1 057 gallons versus 62 gallons in the Bertram 46.6 1975. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
For family outings this is probably the sharpest distinction between the two. The Bertram 510 Convertible 2000 is rated for 15 passengers, while the Bertram 46.6 1975 caps at 14. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Bertram 510 Convertible 2000 could be the deciding factor.
Bottom line: Choose the Bertram 510 Convertible 2000 if your priority is putting more people on the water — it handles 15 passengers and at 51,0 ft it has the deck room to back that rating up comfortably. The Bertram 46.6 1975 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 14 that costs less to run day-to-day.