I shoot a 6.5x55 with the Ackley shoulder on it using Lapua brass. My accuracy load is 2910fps with a 140gr bullet w/ 50.5gr of H4831 and Fed 210s. All of the hot shooting 6.5x284 shooters use H4831 and H4831SC also and their accuracy loads chrono in the mid 2900 range also. So I duplicate thier ballistics within reason with 3-4 less grains of powder using good Lapua brass and not the soft Norma stuff. This is with the Ackley shoulder on it though. Nothing wrong with a std 6.5x55 Swede either. It has a great track record that is hard to argue against. But if this is for hunting then you can load up the 6.5x284 case to higher velocities on the upper end. I've gone up to 2985fps with my 6.5x55AI and the 6.5x284 can easily go over the 3000fps mark. But when backed off and comparing one accuracy load against another I can stay right with them. I've got a second barrel for my HG also that is chambered in 6.5x55AI also.
I've fired 2 official Screamer groups with it in BR competition, (2) top 20 patches in the IBS National Championships for 2001 and 2002 and 6th in the 2001 PA World Open in LG Group catagory and numerous individual wins. My smallest group at 1000yd so far is a 3.187" with a perfect 50 score last September. Have one other group in the 3" range and several in the 4 and 5" range so this isn't a fluke. Wish I had more time to really play with it to keep it tuned up to be more consistant, but other things are more important right now.
Am I a fan of this case......? [img]images/icons/grin.gif[/img]
So to directly answer your question... it isn't the brass. I agree with Fatboy that it must be the older actions and liability reasons. But hot-rodded in a modern action and barrel it will run with the big dogs for killing paper. So it is more than a 260 and runs neck-and-neck with the 6.5x284 for accuracy loading.
[ 01-07-2003: Message edited by: Steve Shelp ]