OK, so I have a relatively stock Sako TRG-S chambered in the Lazzeroni 7mm, the Firebird. It's put in several fine hunting seasons, being very consistent at about 1 MOA with factory-loaded 140 gr. Nosler Partitions (probably the only instance in history where the Partitions are the accuracy leader). Zeroed at 300 yards, it's been quite deadly out to that range. Handloading has not improved the groups significantly...not surprising given its factory barrel. Good performance, but not great, and I find myself using my more accurate rifles. So, what to do with the Sako? My first step would be to rebarrel, 'natch. But, since I'm going to do that, should I switch to another chambering? What's the 7mm chambering of choice these days, for hyper accurate performance at longish ranges? Or should I drop to 6.5x284, which seems to be very successful? And can I even contemplate using the TRG-S beyond 500 yards anyway? It doesn't seem the stiffest design.