Personally, I would stick with the Barnes. The GMX would be basically the same, from a different manufacturer.
My experience with the SST is like a little grenade. I only use those in my wife’s 7-08 for deer/antelope. But shoot extremely well but too fragile for a .280 or 7 mag so I wouldn’t suggest them for the 300 WM.
I don’t have any experience with the inter bond although I have several boxes I never got around to loading because I found something else that worked first.
You didn’t ask, but I believe a great bullet for both expansion and penetration is the Nosler Accubond.
Extremely accurate in my 7 mag.
Great penetration on elk.
Good expansion on deer.
I use the 160 gr in .284. I’d recommend the 180 gr in .308.