I shot my bull with a 6.5 SAUM last fall with 130 grain Berger HVLD's. It was 320 yards running up a ridge away from me. I put the first one kinda far back because I wasn't leading him, hit just in front of rear quarters through the spine, that one stopped him. Sent another right between the shoulders, just to the right of the spine, that one dropped him. I think the 130's are good to go for the distances you are talking about.
The reason I went with them was because they shot better out of my rifle than the 140's, I would rather be able to "within reason" put it exactly where it needs to go. I wouldn't give up accuracy for a heavier projectile. Especially if you have good data for the load you are running now, I say run it!gun)
Here is my bull from the Bridger Tetons last fall, shot it suppressed with a 6.5 SAUM at 320 yards. We heard the bull bugling (mid October, I thought it was way to late for that, but he was bellering to beat hell!) I worked my way over to draw while my cousin tied up the horses, right after I got to the edge of the draw I saw a five point rag horn bull on the other ridge just above the draw where I could hear them bugling. I ranged him (the raghorn), he was at 320 yards. I could tell by the tone of the bugle that the other bull that I had not yet seen was bigger, I could literally feel his chuckle at the end of his bugle in my chest as it echoed up the canyon. My cousin spotted the bull first, but could not put me on him (he had already shot his bull) I moved my position and dialed my USO scope for my 320 yard dope and started scanning the hill side, some cows above us had busted us and all the elk were blowing up out of the bottom. I spotted a cow through my scope that was hauling *** through a clearing, right then my cousin asked me if I saw the cow running through the clearing, I said yes and he said, alright that big bastard is going to be coming through that same clearing right behind her, as soon as I saw him in my sight picture I squeezed it off, hit him in the spine kinda far back, that stopped him, I quickly racked a round and sent another and that dropped him....then I spent a day and a half packing him out of some pretty miserable steep country...too steep to get the horses all the way too him and there was a rock vertical ledge below him so I had to quarter it and bone out the rear quarters and pack it about 1/8 mile up the ridge to where we could get the horses too....here are a few pics
