Geoff, i had a free floating bore at my rifle and you have to check the aluminium ring, there is sometimes a lot of greenish dirt in it. Clean it and check if it is really round and has no dings or so. Important is that the action is tight to the wood and i made a bedding under the chamber for that reason. Check out that the barrel is really free when it is getting hotter. In my case the forestock was touching the barrel, but only after firing 15 or 20 rounds. After that the shots where wandering to one side at the target. After clearing all of this little problems it shoots around 1"-2" with the GP11 ammo. And i purchased a higher frontblade for 24 Euros at Schwaben arms.
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