I think Rick James in putting bands on his rage heads.....and even still they;re opening on impact with a sheet of notebook paper. Who knows what it takes to open an unbanded head.....but "less".

When they fail me....I'll switch....but even then it won't be switching back to a fixed head. I have overkill KE....so I might as well take advantage of that by getting the maximum cutting surface into that deer (as Matt/PA eluded to).