I’ve just bought a pig saddle copy off fleabay and mounted it onto an old camera tripod with a tilt and pan head, it works great to support the rifle for long durations and is very quick and easy to use, however it doesn’t really offer much more by way of stability than a tripod with a yolk rest. I can however leave the tilt and pan head a little tight which definitely helps to dampen any body sway, the tripod is also very robust which also helps.
I too am thinking of a B&Q set of quads to try but can’t help thinking they would be a right faff if the target is on the move.
Originally I was using a Vanguard T62U tripod that I was given and onto that I made a support that held the rifle hands free, I also made a tilting head. It was extremely stable and easy to use but the Vanguard isn’t really a tripod, it is more a bipod with a third leg as the two rear legs swing in a single plane, this means that the vertical axis is actually leaning over away from the user which made panning problematic. It was also a PITA to carry. It did however prove much more steady than everything else I’ve tried.
I looked at a Gen3 Primos but frankly wasn’t impressed by how flimsy it felt, far too much flex and too much to go wrong.
