Heavy on the YET. Yes I would try the 100 grain Partition in a second. Nosler brought this bullet out for the 260 for deer hunting. The SD is just 205 but the 120 grain pro-hunter in the 280 is also 205 and it performs great at 2800 FPS. The 120 Ballistic tip would be ideal and I have talked to hunters who have used it with good success. I bought some bulk corelokts for my 260 and they did a good job. AND CHEAP.

RH. I have not tried that 156 grain bullet but I have used the 160 grain Hornady RN for close range hunting. I would still pick the 140 Interlock as a all around big game bullet. In the 6.5 that is. Some say the fast twist in the 6.5, at leasst in the old mausers made them perform beyond their paper ballistics. I can't say for sure on that though I never really got into twist rates to much.