I've used the Bushing-Bump in 308 and 284 Win for some years now. The 284 was a bored-out 6.5-284 model as Forster didn't make it at that time in 284 - "No demand for this caliber" they responded when I emailed them, but I see it's listed now.
My 284 loads are moderate pressure ones, but my 308 Win FTR load is rated at getting on for 63-64,000 psi if QuickLOAD is to be believed, 3,050 fps in northern UK temperatures of around 40-65F with the 155.5gn Berger over IMR-8208XBR in a 32-inch barrel, and at the F-Class Worlds at Raton in 2013 that rose to right on 3,100 fps or ~68.000 psi in 90-deg plus temperatures. In a 'minimum-SAAMI' chamber, the Lapua Palma brass has never been FL sized and both chambering and extraction in a Stolle Atlas FTR action are still easy with cases that have had several firings including those that had a couple in the hot / high pressure New Mexico conditions. There is no 'click' at all. That may not apply to other cartridge designs or weaker brass of course being run at equivalent pressures.
I can't pass on others' experiences as strangely, the Bushing-Bump form doesn't seem to have caught the imaginations of competitive shooters here. I don't know how often I've been told that I really ought to FL size as any form of NS is inadequate even with the shoulder bump. What my B-B form experiences say to me is that unless pressures rise to a point where the lower case body has to be resized as a matter of necessity, the benefits coming from FL sizing are primarily in the shoulder bump work. In a factory rifle with a likely less concentric chamber, there may still be benefits in reducing the majority of the case-body diameter.
Now that Forster has a much larger range of cartridges in its B-B die inventory, if I were starting out today, I'd likely use this type for the majority of cartridges I load instead of my usual combination of a Redding body die in a bench press and a Wilson NS die in an arbour type.
