I use the CT Partition Gold bullet in my 7mm mag for elk (it's actually my son's rifle - I use a .308 and just handload for him). These are getting very tough to find, however, and I have a good supply of Fail Safes for it as a back-up. I like the golds because they have a little less lead up front than the partitions, and have given great penetration. Through and through wounds are the norm with these guys. Two of the 7mm mags at camp are using these and they are dropping elk pretty quick.
Grand Salami would be 2nd choice, by default, because... Accubonds haven't given the performance we'd like (I use "we" because everybody at elk camp uses a 7mm mag but me, so we have a decent amount of "data" and some good ole stupid 'which bullet is best' arguments). The bigger bulls, in a couple of instances, have only been wounded and were able to go a ways, or required a second or third shot. We had a cow, who we thought took a good hit with one, run off - we never found her...tracked her for the rest of the day but lost the trail near dusk and couldn't pick it up the next morning. Makes me sick every time I think about it.
You didn't mention Barnes, which, given the drying up of the CT bullets, some of the guys are starting use these, with good results. They really do seem to work well, but also seem to trash a lot of meat. Dead is dead, though.
I'd think the GS would be a fine bullet for elk. No experience with it, but I'd use it.
Tom