I believe the newer Bernina's that use the larger bobbin are a proprietary, unique bobbin size. So not compatible with anything else and a different size from everything else. Which is why you can't use generic bobbins in your Bernina without messing it up. They look like the larger class M bobbins that longarms use but they aren't. Your best bet is to check with your Bernina dealer but I don't think Towa makes a guage for those proprietary bernina bobbins and bobbin cases. With the towa you have to insert the entire bobbin case into the gauge, not just the bobbin. So there is no fudge factor.
Edited to add, this site shows which machines are compatible with the TM2 guage and the Bernina 430 is not listed. They list
204-213 & 317-380 but they do list a 430 under the Bernette name. I don't think they are the same machine but I may be wrong.
https://www.allbrands.com/products/5...thread-tension