they do seem to be variable.

I tuned one about 15 years ago (just basic guides / sleave) and it shot very nice with good accuracy.

However a chap at our club got a new one, and no-one could get it to group under 1" at 20 yards

The pop up loading gate is obviously the likely culprit. Shame as it's a cosmetically neat concept, and inherently very safe, but the gamo RB guns (CFX) are direct competitors, and are in reality more reliably accurate with their direct loading system, and just as safe.

So if you want an accurate HW57, buy a Gamo CFX...