I agree that in the OP's case it looks as if rope on rope was the culprit. Regardless my own personal experience has taught me that putting a carabiner in the system when negative rigging bigger stuff is asking for trouble...After a destroyed biner gate or 2 I stopped doing it.....The convenience of the biner just wasn't worth the risk for me.....But in the OP's post the biner was not the weak point it was the rope on rope friction that was in question. Has anybody esles seen a rope smashed besides me? Biner or knot rigging gear gets beat up.
I’ve regularly seen where a triple action opens up when load testing base anchors. With a log (or limb) for that matter flopping around in rigging I see little to no place for biners as a choked termination in riggingWell, yes it does matter. I have seen dual action roll open while rigging. And that biner looks like it was open at peak force. Maybe there is something I am not seeing in the picture.
The bend radius certainly leaves something to be desired. Also that cotter pin catches my eye like it will catch and pull cover strands.There are better choices for knotless setups than a carabiner, if you're going to negative rig.
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You can slam these things around and gate is almost never tweaked. The gate has nothing to do with the rating of the hook, either. They're also easier on the rope than a 'biner.
Available in sizes for even the biggest rigging needs/ropes. But, don't drop it on your groundie's noggin.