Hi, welcome.
Lot's of info here, as you get used to the site, you'll start picking up on a few details. This thread has been dormant for almost a year, you may or may not get a response. Especially with a fairly uncommon round like the 401.
Not a bad thing to resuscitate a semi-dead thread, I've done it myself on more than one occasion. I like the idea of trying to keep all the data for a particular cartridge together. Makes life easier if you're researching a cartridge that is new to you.
Especially ones that 98% of the world has never heard of. Like a 320 Bulldog or a 280 Ross.