Here's my Buffalo Bar GM's. The buffalo bar is way easier on the shoulders, but the bar sits really high. I tried a much wider stance as well which seems to put more pressure on my lower back than my usual stance.
Funny thing about GM's is that the harder it gets, you can still do more lol. I quit after the 335 x 3.
FYI - If the video is "no longer available", it's because Youtube is doing site maintenance yet again.