Having read, somewhere, that the groove diameter was .3095", I'd never loaded anything but .311"-.312" bullets run through a .309" sizer.
I started with some 90gr Sierras that had a lot of lead exposed at the tip, and had some feeding issues with those.
I soon discovered the Hornady 85gr XTP, and that became my go-to bullet; expensive, but the crimp groove is in exactly the right place.
I loaded some hundreds of those over loads of Unique, N340, and probably a couple of others.
After discovering the .309", 90gr XTP, I decided to give that a try. No crimp groove, but wasn't sure that was important.
Loaded over 5.2 of N340, I had some functional issues, but am not ready to blame the load, as I was also using a borrowed mag for a few strings.
I shortened the OAL "a smidge", thinking there could have some binding in one of the mags, and I'll try to be more scientific, next range trip.
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