Great suggestions so far... should spice up target practise. My eldest son is getting rather good... but he wants me to get a bipod. Apparently resting on a packet of Lambert and Butler laying on a Black and Decker Workmate isn't cool
As mark said the recoil from a Springer is really weird. Its kind of a back and forth lurch that doesn't combine well with bipods. You could do worse than a sand sock. Literally take an old football sock and fill it with builders sand. You need to come up onto a target just give it a squeeze as you well know Dewi I've had plenty of experience and success shooting, and ill still happily use a sand sock over a bipod