Neale,
Yes, one sizing lasts forever, you never need to buy another one, but you will most likely add more to the collection over the years, as the cast bullet bugs bites hard, I think I'm now up to about 70 something moulds, 3 lube sizers and 20 odd sizing dies, along with endless top punches.
Don't ever want to think about the $ I've sunk into it.

Sorry, forgot to put the finished weight on the last post as well, ready to shoot, they are close enough to 440 grains.

Regards,
David.