the old pleasant point range table is still alive after all these years I see LOL. definately hold that forend........sitting on a towel will do you no favours,maybe get away with it if you using a bi-pod and good repeatable technique... without a good hold of forend it can bounce around,if you were doing this with floppy cock bedding beforehand,20cm group is definately believable....I helped another young chap to tighten his groups up by a HUGE amount just by getting him to do that simple thing.....once upon a time EVERYBODY held a rifle in two hands...now-----not so much.
https://www.ballisticstudies.com/Kno...Forend%21.html
take the time to read this link......it should help explain things and help you out no end.
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