So my rest came in the mail today, super pleased with it. It's as simple as.
The old "Maxboxes" or which I have two, have self-destructed and never were any good anyway.
These things are made from this semi-soft polymer. I guess you could equate it to the hardness of a sand-filled set of leather shooting bags. But way lighter. They won't mark your guns finish, but aren't soft enough to flex when you put weight on the rifle to hang onto it like you do with a kicker or leaper.

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The foam Maxboxes compress with any tension, by the way so do the Lead Sleds with their soft spongy cradles. Awful. I reckon they've got these ones right.

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Each side of both the front and back cradles have a different set of heights, so anything is pretty much possible. To remember which is right for your gun, I suppose you could mark it with a Texta. I found even with this impromptu set up on the silage bales, the crosshairs didn't move from the 30 year old VX2 on the same age old many-thousands-fired 7600 pig hammerer, at my bissaloy pig swinger at about 200m.urprised me how steady and firm this gizmo is.

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The rear rest sits inside the bottom of the front one, squeezes easily inside and stays there. the whole set-up is light and unbreakable. I'd probably advise not to leave it cooking in the sun for months tough, it is May-In-Chyna.
But then, the "Australian Company" foam and wobble-rest Smartrest MaxBoxes are Chinese-made too.

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Now if you are a benchrest paper shooter, this is not for you. Big wide flat forends and sliding sandbags that allow a target gun to recoil back are what you need for that. But this thing, for a bloke in the bush, weighs SFA, won't smash all your other gear up when packed in a car hammering over corrugations and is way steady enough to both test loads, varmint shoot (Is more steady than a bipod) or just practice.
There you have it.